Sleep and Stress: The Complete Guide

What You Need to Know

• About one in three American adults sleeps less than the recommended 7 hours a night: 34.8% of the 444,306 adults in the CDC's 2014 survey (Liu 2016, MMWR).
• Stress predicts bad sleep a year out: in 2,316 adults, each stressful event raised the odds of insomnia by 13%, and racing thoughts after a stressor raised them by 61% (Drake 2014, Sleep).
• A score of 10 or higher on the seven-question Insomnia Severity Index identified insomnia with 86.1% sensitivity and 87.7% specificity in a community sample of 959 people (Morin 2011, Sleep).
• In MIT sleep-lab trials, 0.3 mg of melatonin was enough: in poor sleepers over 50 it restored sleep efficiency, while 3 mg also helped but lowered body temperature and kept melatonin in the blood after sunrise (Zhdanova 2001, Journal of Clinical Endocrinology and Metabolism).
• Cognitive behavioral therapy for insomnia (CBT-I) cut the time to fall asleep by 19 minutes across 20 trials (Trauer 2015, Annals of Internal Medicine), against about 7 minutes for melatonin across 19 trials (Ferracioli-Oda 2013, PLoS One).
• Ashwagandha works on a scale of weeks: a meta-analysis of 5 trials found its effect on sleep was larger at 600 mg a day or more and after 8 weeks or more (Cheah 2021, PLoS One).
• Magnesium helped older adults fall asleep about 17 minutes sooner across three trials in 151 people, on evidence the authors rated low to very low quality (Mah 2021, BMC Complementary Medicine and Therapies).

What do sleep and stress do to each other?

Sleep and stress run on shared wiring, so each can break the other. Sleep depends on sleep pressure, a chemical debt (mostly the signaling molecule adenosine) that builds while you are awake, and on the circadian clock, a timer in the brain's hypothalamus that decides when sleep is allowed. Melatonin is the clock's messenger. The pineal gland releases it as light fades to announce night, not to knock you out.

Stress runs through the HPA axis (hypothalamus, pituitary, adrenal glands), which ends in cortisol, the hormone that raises alertness for a fight that rarely arrives. In a sleep lab, 11 young adults with chronic insomnia secreted more cortisol and ACTH, its pituitary trigger, over 24 hours than 13 good sleepers, most of the excess in the evening and early night (Vgontzas 2001, Journal of Clinical Endocrinology and Metabolism). The authors called it hyperarousal. A sedative does not fix a brain stuck in daytime mode; turning the volume down does.

Poor sleep also shows up far from the bedroom. In a quarantine study, 164 healthy adults wore wrist sleep trackers for a week. Then researchers dripped a cold virus into their noses, and those who had averaged under 5 hours a night had 4.5 times the odds of a clinical cold of those sleeping more than 7 (Prather 2015, Sleep). The American Academy of Sleep Medicine and the Sleep Research Society set the adult target at 7 hours or more (Watson 2015, Sleep).

The clock reaches into metabolism too. In mice, NAMPT, the enzyme that rebuilds the energy coenzyme NAD+, cycles daily under clock-gene control (Ramsey 2009, Science). Mouse biology, not a buying reason, but it ties sleep to the complete guide to NAD+ and cellular energy.

Go deeper: the melatonin monograph explains what the hormone signals and grades the evidence for each sleep outcome.

Who sleeps badly, and how common is it?

About one in three American adults sleeps less than 7 hours: 34.8% of the 444,306 adults in the CDC's 2014 survey (Liu 2016, MMWR). Insomnia is narrower: trouble falling or staying asleep despite the chance to sleep, plus a cost the next day. Across more than 50 population surveys, about a third of adults report an insomnia symptom, 9% to 15% report daytime consequences, and about 6% meet diagnostic criteria, more often women (Ohayon 2002, Sleep Medicine Reviews).

Can stress keep you from sleeping? Yes. Researchers followed 2,316 adults without insomnia for a year. Each stressful event raised the odds of insomnia a year later by 13%, racing thoughts after a stressor (cognitive intrusion) raised them 61%, and high sleep reactivity, a trait describing how easily sleep falls apart under pressure, raised them 78% (Drake 2014, Sleep). The event mattered less than how much the mind chewed on it.

Then there is the group no supplement helps. Obstructive sleep apnea, repeated collapse of the airway during sleep, is present at moderate-to-severe levels in an estimated 17% of US men and 9% of US women aged 50 to 70, and in 10% of men and 3% of women aged 30 to 49 (Peppard 2013, American Journal of Epidemiology).

The other risk factors are age, being female, a stressful year, late caffeine, evening screens, and a nightcap. Low magnesium intake is common too: 48% of Americans ate less than they needed from food in 2005 to 2006 surveys (Rosanoff 2012, Nutrition Reviews).

Go deeper: our immune health overview explains the system that short sleep showed up in above.

How do you know what kind of sleep problem you have?

No blood test diagnoses bad sleep, and no cortisol test diagnoses stress. The useful tools are a two-week sleep diary and two short questionnaires. Log bedtime, minutes to fall asleep, wake-ups, final wake time, caffeine, alcohol, and how the next day felt. Two weeks reveals a pattern that one bad night hides.

The Insomnia Severity Index (ISI) is a seven-question score from 0 to 28 that measures how much a sleep complaint costs you (Bastien 2001, Sleep Medicine). In 959 community adults, a score of 10 or higher identified insomnia with 86.1% sensitivity, meaning it caught most real cases, and 87.7% specificity, meaning it rarely flagged people who were fine (Morin 2011, Sleep).

The STOP questionnaire screens for apnea with four yes-or-no questions: loud Snoring, daytime Tiredness, Observed pauses in breathing, and high blood Pressure (Chung 2008, Anesthesiology). Adding body-mass index, age, neck size, and sex (STOP-Bang) raised its sensitivity for moderate-to-severe apnea to 92.9% in surgical patients checked against polysomnography, the overnight lab study of breathing, brain waves, and oxygen. Snoring plus observed pauses means a sleep study comes first.

For stress, researchers use the Perceived Stress Scale, a short self-rating of recent stress (Cohen 1983, Journal of Health and Social Behavior). Skip the saliva cortisol panels sold to diagnose "adrenal fatigue": a review of 58 studies could not substantiate that the condition exists (Cadegiani 2016, BMC Endocrine Disorders).

Go deeper: the nighttime routine we recommend is the one to run while you keep the diary.

What can habits and food do before any supplement?

More than any capsule. The best-tested treatment for chronic insomnia is cognitive behavioral therapy for insomnia (CBT-I), a structured program combining at least three of these: sleep restriction (limiting time in bed to time actually asleep, then expanding it), stimulus control (bed is for sleep), relaxation training, sleep hygiene, and cognitive therapy for the beliefs that keep you awake.

The numbers are not close. Across 20 trials in 1,162 adults, CBT-I cut the time to fall asleep by 19 minutes and time awake after first falling asleep by 26 minutes, and the gains held at follow-up (Trauer 2015, Annals of Internal Medicine). Melatonin manages about 7 minutes (Ferracioli-Oda 2013, PLoS One). The American College of Physicians makes CBT-I the first treatment for chronic insomnia (Qaseem 2016, Annals of Internal Medicine), and the American Academy of Sleep Medicine advises against sleep hygiene alone (Edinger 2021, Journal of Clinical Sleep Medicine). Evidence grade: Strong.

Four habits have direct evidence. Caffeine at 400 mg disrupted sleep even when taken 6 hours before bed (Drake 2013, Journal of Clinical Sleep Medicine). Alcohol speeds sleep onset, then fragments the second half of the night (Ebrahim 2013, Alcoholism: Clinical and Experimental Research). Reading a light-emitting e-reader before bed, instead of a printed book, delayed sleep, suppressed melatonin, and left people groggier the next morning (Chang 2015, PNAS). Regular exercise brought small gains in total sleep and moderate gains in sleep quality across 66 studies (Kredlow 2015, Journal of Behavioral Medicine), a Strong grade for modest effects.

Food's clearest lever is magnesium. Men need 400 to 420 mg a day and women 310 to 320 mg; an ounce of roasted pumpkin seeds supplies 156 mg, an ounce of almonds 80 mg, and half a cup of black beans 60 mg (NIH Office of Dietary Supplements). Seeds at lunch and beans at dinner cover at least half a day's need before anyone opens a bottle.

Go deeper: four ways to help your body relax covers breathing, walking, and writing it down when stress builds during the day.

When does a supplement make sense, and which one?

Supplement when the problem is timing, a short disruption, or stress you are also working on, and only after ruling out a sleep disorder. Nothing here replaces CBT-I for a months-long problem; the American Academy of Sleep Medicine's 2017 guideline suggests clinicians not use melatonin to treat chronic insomnia (Sateia 2017, Journal of Clinical Sleep Medicine).

Melatonin first, because dose is where it goes wrong. In MIT sleep-lab trials, 0.3 or 1 mg in the evening sped sleep onset without a morning hangover (Zhdanova 1995, Clinical Pharmacology and Therapeutics). In poor sleepers over 50, 0.3 mg restored sleep efficiency and normal nighttime melatonin levels; 3 mg also improved sleep but lowered body temperature and kept melatonin elevated into daylight (Zhdanova 2001, Journal of Clinical Endocrinology and Metabolism). Across 19 trials in 1,683 people, sleep came about 7 minutes sooner, and the gain did not fade with use (Ferracioli-Oda 2013).

Timing does more than dose. Taken 2 to 4 hours before a person's natural melatonin rise, 0.5 mg moved the body clock earliest (Burgess 2010, Journal of Clinical Endocrinology and Metabolism). For jet lag, melatonin near the destination's bedtime eased symptoms in 9 of 10 trials; 0.5 to 5 mg worked similarly, and doses above 5 mg added nothing (Herxheimer 2002, Cochrane Database of Systematic Reviews).

For adults 55 to 80 with insomnia, 2 mg of prolonged-release Circadin shortened sleep onset by 24.3 minutes, against 12.9 on placebo (Wade 2007, Current Medical Research and Opinion). In a larger trial of adults 18 to 80, benefits held for 6 months without tolerance, withdrawal, or rebound (Wade 2010, Current Medical Research and Opinion).

Does magnesium help you sleep? A little, mostly in people short on it, and the grade is Preliminary. In 46 older adults with insomnia and low magnesium intake, 500 mg a day of elemental magnesium as oxide for 8 weeks improved insomnia scores and sleep onset (Abbasi 2012, Journal of Research in Medical Sciences). Pooled trials agree, weakly. Across three in 151 older adults, sleep came 17 minutes sooner, on low to very low quality evidence (Mah 2021, BMC Complementary Medicine and Therapies).

Form matters for absorption. At 300 mg a day for 60 days, citrate and an amino acid chelate were absorbed better than oxide, which did no better than placebo (Walker 2003, Magnesium Research), although the older-adult sleep trial above used oxide. In 155 adults with poor sleep, 250 mg a day as bisglycinate gave a small 4-week benefit, larger in low-magnesium eaters in an exploratory analysis (Schuster 2025, Nature and Science of Sleep). The magnesium monograph compares six forms; our chelate chemistry paper explains how amino acid chelates are made, and our plain-language magnesium primer covers the basics.

Does ashwagandha help with stress and sleep? For stress, yes, with caveats. Ashwagandha (Withania somnifera) is an Ayurvedic root sold as an adaptogen, meaning a herb said to help the body handle stress. In 64 chronically stressed adults, 300 mg of root extract twice daily for 60 days lowered every stress scale and serum cortisol more than placebo did (Chandrasekhar 2012, Indian Journal of Psychological Medicine). Pooled across 12 trials and 1,002 people, ashwagandha lowered stress scores, a dose-response analysis favored 300 to 600 mg a day, and the certainty of evidence was low (Akhgarjand 2022, Phytotherapy Research). Grade for stress: Moderate.

Sleep follows the same slow pattern. In 150 healthy adults with unrefreshing sleep, 120 mg of the Shoden extract for 6 weeks improved self-rated sleep quality 72%, against 29% on placebo (Deshpande 2020, Sleep Medicine). Across 5 trials the effect was small but significant, and larger at 600 mg a day or more and after 8 weeks or more (Cheah 2021, PLoS One). Grade for sleep: Moderate, and expect nothing the first night.

What is L-theanine good for? Calm without sedation. At 50 mg, this amino acid from tea leaves raised alpha brain-wave activity, the relaxed but alert pattern (Nobre 2008, Asia Pacific Journal of Clinical Nutrition), and at 200 mg a day for 4 weeks it improved sleep-quality scores in 30 adults, in a trial with Taiyo Kagaku co-authors (Hidese 2019, Nutrients). Grade: Preliminary. Paired with caffeine it turns into a focus ingredient, covered in our guide to nootropics for memory and focus.

5-HTP, the step between tryptophan and serotonin, has the thinnest file, graded Insufficient: one 12-week trial in 30 older adults at 100 mg a day, without a placebo, in which only poor sleepers improved (Sutanto 2024, Clinical Nutrition). Passionflower rates Preliminary: a daily cup of the tea for a week improved diary-rated sleep quality in 41 young adults (Ngan 2011, Phytotherapy Research).

Go deeper: 5-HTP vs melatonin, side by side explains why melatonin wins for most people and when 5-HTP gets a turn.

Who needs a different plan?

Adults over 55 make less melatonin as they age (Vural 2014, Drugs and Aging), so take the lowest immediate-release dose that works, or the 2 mg prolonged-release form tested in adults 55 to 80. The gut absorbs less magnesium with age and the kidneys excrete more (NIH Office of Dietary Supplements).

Pregnancy and breastfeeding narrow the list. Melatonin lacks safety research there (NCCIH on melatonin), and ashwagandha should be avoided (NCCIH on ashwagandha). In pregnancy, magnesium needs rise to 350 to 360 mg a day from all sources (NIH Office of Dietary Supplements). Anything beyond the prenatal vitamin goes past the obstetrician first.

Children: lock the bottle. Poison centers logged 260,435 melatonin ingestions by people 19 and younger from 2012 to 2021, a 530% rise; five children needed a ventilator and two died (Lelak 2022, MMWR). Melatonin for a child is a pediatrician's call.

Medications and conditions: no 5-HTP alongside serotonergic drugs (see the next section). Skip ashwagandha with thyroid or autoimmune conditions unless your doctor agrees (NCCIH); in 50 adults with mildly underactive thyroid function, 600 mg a day raised the thyroid hormones T3 and T4 over 8 weeks (Sharma 2017, Journal of Alternative and Complementary Medicine). Travelers crossing five or more time zones have the strongest melatonin case; studies in shift workers were small or inconclusive (NCCIH).

Go deeper: the ashwagandha monograph has the liver and thyroid detail and compares KSM-66, Sensoril, and plain root powder.

What goes wrong?

With melatonin, mostly the dose and the clock. Across 37 trials at 0.15 to 12 mg a day, the commonest side effects were daytime sleepiness (1.66%) and headache (0.74%), but few trials ran past 4 weeks (Besag 2019, CNS Drugs). A health-record study presented at a 2025 cardiology meeting reported a heart failure signal with long-term use; a 2026 national survey analysis found no significant association and flagged confounding by the poor sleep that drives melatonin use (Khan 2026, Open Heart). Unsettled, not proven.

The label may be wrong. In 31 supplements tested, melatonin content ranged from 83% below to 478% above the label, and 26% contained serotonin (Erland 2017, Journal of Clinical Sleep Medicine). In 2023, 22 of 25 gummy products were mislabeled, at 74% to 347% of the stated dose (Cohen 2023, JAMA, as summarized by NCCIH).

Melatonin interacts with real drugs. The antidepressant fluvoxamine raised melatonin exposure 17-fold in 5 healthy men (Härtter 2000, Clinical Pharmacology and Therapeutics). In 47 people whose blood pressure was controlled on nifedipine, 5 mg of evening melatonin for 4 weeks raised 24-hour systolic pressure by 6.5 mmHg (Lusardi 2000, British Journal of Clinical Pharmacology). Taken 15 minutes before a glucose drink, 5 mg worsened glucose tolerance in 21 healthy women (Rubio-Sastre 2014, Sleep), so keep it away from a late meal. People with epilepsy or on blood thinners should use it only under medical supervision (NCCIH).

5-HTP stacks on serotonin drugs. It is a serotonin precursor, and serotonin syndrome, a reaction to too much serotonin, is one of the two safety problems a review of 5-HTP emphasized (Turner 2005, Pharmacology and Therapeutics). The syndrome usually takes two drugs that raise serotonin in different ways: MAOIs, SSRI and SNRI antidepressants, tramadol, dextromethorphan, and St. John's wort are the usual partners, while triptans are now considered unlikely culprits (Foong 2018, Canadian Family Physician).

Ashwagandha carries a rare liver signal: five people in Iceland and the US developed jaundice 2 to 12 weeks after starting it, and liver tests normalized within 1 to 5 months in those followed (Björnsson 2020, Liver International). NIH's integrative health center calls it possibly safe for up to 3 months (NCCIH). Magnesium's problem is the bowel. The supplemental upper limit is 350 mg a day, toxicity risk rises with poor kidney function, and doses belong 2 hours apart from oral bisphosphonates, the bone-density drugs (NIH Office of Dietary Supplements).

Ask a clinician first if you snore loudly or someone has seen you stop breathing, if your ISI sits at 10 or higher for weeks, if you take serotonergic, blood-pressure, blood-thinning, seizure, or thyroid medication, or if you have liver or kidney disease or are pregnant.

Go deeper: how to know what is actually in a supplement, because several problems above start with an unchecked label.

Mt. Angel Vitamins products for sleep and stress

Eight of our products contain an ingredient from this guide. Six fall within the dose range of the trials above and two do not, so we say which is which. Prices and label amounts are from our product pages on October 14, 2026.

Sleep Dots dissolve in the mouth and hold 1 mg of melatonin each, the top of the 0.3 to 1 mg range in the timing trials. Sixty dots cost $15.99, or $0.27 a day at one dot. It supports a healthy sleep-wake cycle.* The label allows up to six dots; the evidence argues for one.

Melatonin 3 mg Timed Release releases about 1.5 mg in the first hour and the rest over the next five. Sixty capsules cost $19.99, or $0.33 a day. It supports sleep through the night.* Its 3 mg sits above the 2 mg prolonged-release dose tested in adults over 55, so it is not the low-dose option for falling asleep late.

Good Magnesium gives 200 mg of magnesium per capsule as a rice protein chelate. Sixty capsules cost $21.99. One capsule ($0.37 a day) sits a little below the 250 mg bisglycinate trial dose and under the 350 mg supplemental upper limit; two ($0.73) exceed that limit, so that is a clinician call. It supports muscle relaxation and normal nerve function.*

Calming Mag Powder delivers 400 mg of magnesium per 5 g scoop, which fizzes into citrate and related salts in the glass, plus 500 mg glycine and 1,000 IU vitamin D3. Sixty scoops cost $47.99, or $0.80 a day. A full scoop exceeds the 350 mg supplemental upper limit, so start with a half scoop at $0.40. The glycine is a sixth of the 3 g studied (Bannai 2012, Frontiers in Neurology), so we claim nothing for it. It supports relaxation at bedtime.*

5-HTP holds 100 mg of 5-HTP from Griffonia seed per capsule, the dose in the one modern sleep trial, with 10 mg vitamin B6. Sixty capsules cost $19.99, or $0.33 a day. It supports healthy serotonin production.* Skip it with an MAOI, SSRI, SNRI, tramadol, or other serotonergic drug unless your prescriber agrees.

Sleepy Sleep pairs 1 mg melatonin with 25 mg 5-HTP and 50 to 100 mg each of hops, lemon balm, chamomile, and passionflower extracts per capsule. Sixty capsules cost $25.99, or $0.43 a day. The melatonin is the evidence-backed part; we have not matched those herb amounts to published trials, so we claim nothing for them. It supports a healthy sleep cycle.* Its 25 mg of 5-HTP means the serotonergic-medication rule above applies here too.

Two we are not recommending here. CortiResponse has 100 mg of ashwagandha root (not a standardized extract) and 100 mg L-theanine per two capsules, below the extracts in the ashwagandha trials and half the 200 mg in the 4-week theanine trial; for trial-dose ashwagandha, another brand's single-ingredient standardized extract, such as one built on Shoden, is the better buy. Our Relaxing Passion Flower lozenges hold 50 mg of a 4:1 extract, which we cannot match to a published trial.

The manufacturing facts, once. Every product above is made in our own cGMP facility in Mt. Angel, Oregon, and every batch is tested in our in-house lab for identity, potency, and purity. The certificate of analysis for each lot is published on our lab-testing page.

Go deeper: our magnesium buying guide ranks six products, ours included, and gives four of the six categories to Doctor's Best, Thorne, Nature Made, and Life Extension.

The bottom line

If sleep has been bad for months, start CBT-I and rule out apnea before buying anything. If the problem is timing, take 0.3 to 1 mg of melatonin 30 to 60 minutes before bed, not 10 mg. If stress is the driver, give a standardized ashwagandha extract 8 weeks while you work on the stress itself, and bring magnesium intake up to the daily target, from food first.

Go deeper: the melatonin monograph grades each outcome and compares five dose forms; 5-HTP vs melatonin settles the head-to-head; which magnesium to buy for sleep ranks six products on dose and price per day.

Common Myths

"If 1 mg of melatonin is good, 10 mg is better."

Your brain's own nighttime level can be reproduced by about 0.3 mg. In poor sleepers over 50, that dose restored sleep efficiency, while 3 mg also helped but lowered body temperature and left melatonin in the blood after sunrise (Zhdanova 2001, Journal of Clinical Endocrinology and Metabolism). Even for jet lag, doses above 5 mg added nothing (Herxheimer 2002, Cochrane). Past that point, the extra mostly buys melatonin that lingers into the morning.

"Melatonin is a natural sleeping pill."

It is a clock signal that happens to make you a little drowsy. Pooled across 19 trials, it shortened the time to fall asleep by about 7 minutes (Ferracioli-Oda 2013, PLoS One). Its real strength is timing: 0.5 mg taken 2 to 4 hours before your natural melatonin rise moves the body clock earlier (Burgess 2010). Take it at the wrong hour and it backfires. Early in the day, it makes you sleepy and slows adjustment to a new time zone (Herxheimer 2002).

"A glass of wine helps me sleep."

For the first half of the night, it does. Across the studies in healthy volunteers, alcohol at every dose shortened the time to fall asleep, then fragmented the second half of the night and delayed the first bout of REM sleep, the dreaming stage (Ebrahim 2013, Alcoholism: Clinical and Experimental Research). That is the 3 a.m. wake-up with no obvious cause. The nightcap borrows from the morning and never pays it back.

"Stress has worn out my adrenals."

Your adrenals are almost certainly fine, and your stress is real. "Adrenal fatigue" is the label on a lot of saliva cortisol kits and supplement bottles, but a systematic review of 58 studies found the tests gave conflicting results and found no substantiation that it is a medical condition (Cadegiani 2016, BMC Endocrine Disorders). Spend the money on things with trials behind them: CBT-I, exercise, and, if you want a supplement, a standardized ashwagandha extract given 8 weeks.

"Cutting caffeine and screens will fix months of bad sleep."

Those habits matter. Caffeine at 400 mg disrupted sleep even when taken 6 hours before bed (Drake 2013, Journal of Clinical Sleep Medicine), and reading an e-reader before bed suppressed melatonin and delayed the body clock (Chang 2015, PNAS). But the American Academy of Sleep Medicine suggests not relying on sleep hygiene alone for a problem that has lasted months (Edinger 2021, Journal of Clinical Sleep Medicine). CBT-I is the tool with the numbers: 19 minutes faster to sleep and 26 fewer minutes awake (Trauer 2015, Annals of Internal Medicine).

"Snoring and daytime tiredness just mean I need a stronger sleep supplement."

This one costs the most, because it can run for years of bottles. Moderate-to-severe obstructive sleep apnea affects an estimated 17% of US men and 9% of US women aged 50 to 70 (Peppard 2013, American Journal of Epidemiology), and no supplement holds an airway open. Four questions about snoring, tiredness, observed pauses, and blood pressure, plus body-mass index, age, neck size, and sex, caught 92.9% of moderate-to-severe cases in surgical patients (Chung 2008, Anesthesiology). If someone has watched you stop breathing, the next purchase is a sleep study.

Frequently Asked Questions

What is the best supplement for sleep?

It depends on why you sleep badly. For trouble that has lasted months, no supplement beats CBT-I, which cut the time to fall asleep by 19 minutes across 20 trials (Trauer 2015). For falling asleep late, low-dose melatonin at 0.3 to 1 mg, 30 to 60 minutes before bed, has the best support; for jet lag, 0.5 to 5 mg at the destination's bedtime (Herxheimer 2002). Stress-driven sleep? Ashwagandha extract improved sleep across 5 trials, most at 600 mg a day or more for 8 weeks or more (Cheah 2021). Magnesium is weaker, about 17 minutes faster to sleep in older adults, on weak evidence (Mah 2021). Our [magnesium buying guide](/reviews/best-magnesium-supplements-for-sleep-2026) compares six products.

How much melatonin should I take?

Start with 0.3 to 1 mg, 30 to 60 minutes before bed. That is the range the MIT sleep-lab trials used, and in poor sleepers over 50, 0.3 mg restored sleep efficiency while 3 mg lowered body temperature and left melatonin in the blood after sunrise (Zhdanova 2001). For jet lag, 0.5 to 5 mg at the destination's bedtime works, and doses above 5 mg add nothing (Herxheimer 2002). To shift a late body clock earlier, 0.5 mg works best taken 2 to 4 hours before your natural melatonin rise (Burgess 2010). The [melatonin monograph](/ingredients/melatonin) has the full dosing table by situation.

Is it safe to take melatonin every night?

For most adults, at a low dose, short-term nightly use looks safe. In a trial of adults 18 to 80, 2 mg of prolonged-release melatonin kept working for 6 months, with no tolerance and no withdrawal or rebound when stopped (Wade 2010). Across 37 trials, side effects were uncommon and mostly mild, mainly daytime sleepiness and headache, but few trials lasted beyond 4 weeks (Besag 2019). A health-record study presented in 2025 reported a heart failure signal with long-term use; a 2026 national survey analysis did not find one and pointed to confounding (Khan 2026). Use the lowest dose that works.

Does magnesium help you sleep?

A little, on weak evidence, and mostly in people who eat too little of it. In 46 older adults with low magnesium intake, 500 mg a day for 8 weeks improved insomnia scores, sleep efficiency, and time to fall asleep (Abbasi 2012). Three pooled trials in 151 older adults showed about 17 minutes faster sleep onset (Mah 2021). The authors rated that evidence low to very low. In 155 adults with poor sleep, 250 mg a day for 4 weeks produced a small improvement, larger in low-magnesium eaters in an exploratory analysis (Schuster 2025). Since 48% of Americans got less magnesium than they needed from food in 2005 to 2006 surveys (Rosanoff 2012), fix intake with food first.

Which form of magnesium is best for sleep?

Citrate, bisglycinate, or an amino acid chelate, at about 250 to 350 mg of elemental magnesium. In a 60-day head-to-head absorption trial at 300 mg a day, citrate and an amino acid chelate were absorbed better than oxide, which did no better than placebo (Walker 2003). Bisglycinate at 250 mg a day produced a small improvement in insomnia scores over 4 weeks (Schuster 2025). Oxide still worked in the 500 mg older-adult trial (Abbasi 2012). Threonate improved ring-measured deep sleep scores in one 21-day trial with co-authors from an ingredient company ([Hausenblas 2024](https://pubmed.ncbi.nlm.nih.gov/39252819/)). Read the elemental milligrams on the Supplement Facts panel. Our [magnesium buying guide](/reviews/best-magnesium-supplements-for-sleep-2026) ranks six products on exactly that.

Does ashwagandha help with stress and sleep?

Yes for stress, on low-certainty evidence, and modestly for sleep. Across 12 trials and 1,002 people, ashwagandha extracts lowered stress scores, and a dose-response analysis favored 300 to 600 mg a day (Akhgarjand 2022). In a 64-person trial of chronically stressed adults, 300 mg twice daily for 60 days lowered serum cortisol and every stress scale measured, compared with placebo (Chandrasekhar 2012). For sleep, a meta-analysis of 5 trials found a small but significant improvement, larger in people with diagnosed insomnia, at 600 mg a day or more, and after 8 weeks (Cheah 2021). The [ashwagandha monograph](/ingredients/ashwagandha-withania-somnifera) compares KSM-66, Sensoril, and plain root powder.

How long does ashwagandha take to work?

Plan on 6 to 10 weeks. The stress trials judged their results at 8 weeks or 60 days ([Salve 2019](https://pubmed.ncbi.nlm.nih.gov/32021735/); Chandrasekhar 2012; [Lopresti 2019](https://pubmed.ncbi.nlm.nih.gov/31517876/)). The sleep trials ran 6 weeks with 120 mg of the Shoden extract (Deshpande 2020) and 10 weeks with 300 mg twice daily, where the difference from placebo in time to fall asleep reached significance at week 10 ([Langade 2019](https://pubmed.ncbi.nlm.nih.gov/31728244/)). The sleep meta-analysis found larger effects after 8 weeks or more (Cheah 2021). Nothing in the trials suggests a first-night effect, so judge it at two months, not two days.

Can stress keep you from sleeping?

Yes. In 2,316 adults with no history of insomnia, each stressful event raised the odds of developing it a year later by 13%, and racing thoughts after a stressor raised them by 61% (Drake 2014). People whose sleep falls apart easily under pressure, a trait called sleep reactivity, carried 78% higher odds. The biology fits: adults with chronic insomnia secreted more cortisol and ACTH across 24 hours than good sleepers, with the excess concentrated in the evening and the first half of the night (Vgontzas 2001). The fix is lowering arousal through CBT-I, relaxation training, and exercise, not sedation.

What is L-theanine good for?

Calm without drowsiness, on small trials. L-theanine, an amino acid from tea leaves, raised alpha brain-wave activity, a relaxed but alert pattern, at 50 mg (Nobre 2008), and blunted heart-rate responses to a mental arithmetic stressor ([Kimura 2007](https://pubmed.ncbi.nlm.nih.gov/16930802/)). At 200 mg a day for 4 weeks, it improved stress-related symptoms and sleep-quality scores in 30 adults (Hidese 2019), and a review of 9 trials suggested 200 to 400 mg a day ([Williams 2020](https://pubmed.ncbi.nlm.nih.gov/31758301/)). Evidence grade: Preliminary. Paired with caffeine, it becomes a focus ingredient, covered in our [guide to nootropics for memory and focus](/reviews/best-nootropic-supplements-memory-focus-2026).

Is 5-HTP or melatonin better for sleep?

Melatonin, for most people. It has a meta-analysis of 19 trials, a Cochrane review, and dose-finding trials at 0.3 to 1 mg (Ferracioli-Oda 2013; Herxheimer 2002; Zhdanova 2001). 5-HTP has one 12-week trial in 30 older adults. It had no placebo group, and only the poor sleepers improved (Sutanto 2024). 5-HTP is a serotonin precursor, and with MAOIs, SSRIs, SNRIs, or tramadol it carries a risk of serotonin syndrome (Turner 2005; Foong 2018). Melatonin's interactions run through other routes, such as the 17-fold rise with fluvoxamine (Härtter 2000). Our [5-HTP vs melatonin comparison](/compare/5-htp-vs-melatonin) covers the one situation where 5-HTP gets a turn.