Ashwagandha for Sleep: What the Trials Show and Who Should Skip It

If you've spent too many nights staring at the ceiling, a plant extract with a reputation for sleep sounds like an easy fix. Ashwagandha (Withania somnifera), a root long used in Ayurvedic medicine, is sold as exactly that, with promises of deeper sleep and calmer nights.

The trials paint a smaller picture. Ashwagandha did beat placebo for sleep in several randomized trials, but the gains were measured in minutes, showed up after weeks rather than nights, and came from small studies, several of them by the same research team using extract donated by its manufacturer. That doesn't make it useless. It means you should know how big a benefit to expect, how it stacks up against treatments with stronger evidence, and who shouldn't take it at all.

This review covers all three, along with the newest trials, how ashwagandha might work, the doses studied and what's still unknown. If your interest is training rather than sleep, our ashwagandha and exercise performance review covers those trials.

Does Ashwagandha Help You Sleep?

Yes, a little, in the trials so far. When five randomized trials were pooled in 2021, ashwagandha improved overall sleep compared with placebo: people fell asleep sooner, slept longer, woke less during the night and spent more of their time in bed asleep (Cheah and colleagues, 2021). The effect was clearer in people with insomnia than in healthy sleepers.

In practical terms, the best-measured gain is a few minutes off the time it takes to fall asleep and a few points of sleep efficiency, on top of what placebo achieved. That's worth knowing before you expect a supplement to fix a sleep problem on its own.

The Research: What Studies Show

Cheah 2021: the sleep meta-analysis

Cheah and colleagues pooled 5 randomized controlled trials with about 400 participants, all run in India, lasting 6 to 12 weeks. Ashwagandha improved overall sleep with a standardized mean difference of 0.59, which the authors called a small but significant effect. It shortened sleep onset (0.53), lengthened total sleep time (0.45), cut wake time after falling asleep (0.39) and raised sleep efficiency (0.68). Scores on the Pittsburgh Sleep Quality Index, pooled from only 2 trials, didn't change significantly.

Three subgroups stood out. The effect was larger in people diagnosed with insomnia (0.84) than in healthy adults (0.63), at doses of 600 mg a day or more (0.69) than below it (0.44), and in trials lasting 8 weeks or more (0.68). People also felt more mentally alert on waking and less anxious. The reviewers rated the overall certainty as moderate, noted that only two trials combined questionnaires with objective sleep tracking, and reported that manufacturers didn't respond to their requests for unpublished trials.

Langade 2019: adults with insomnia

Langade and colleagues (2019) gave 60 adults with insomnia 300 mg of root extract twice a day or a placebo for 10 weeks, and measured their sleep with wrist-worn activity trackers. At the start, both groups took about 42 minutes to fall asleep. By week 10, that dropped by about 13 minutes with ashwagandha and by 8 minutes with placebo, a 5-minute gap that was statistically significant. Sleep efficiency rose from 75.6 to 83.5 percent with ashwagandha and from 75.1 to 79.7 percent with placebo.

Total sleep time rose by about 50 minutes with ashwagandha and 29 minutes with placebo, a gap the trial's own table didn't show as significant. Questionnaire scores for sleep quality and anxiety improved more with ashwagandha. The placebo group's improvement is a reminder of how much of any sleep aid's effect comes from expectation and routine.

Langade 2021: healthy sleepers and people with insomnia

The same team then ran an 8-week trial in 80 adults, half of them healthy and half with insomnia (Langade and colleagues, 2021). Sleep improved in both groups, more so in the insomnia group, and sleep efficiency and sleep onset changed the most. The extract was well tolerated regardless of age or health status.

Deshpande 2020: unrefreshing sleep in healthy adults

Deshpande and colleagues (2020) enrolled 150 healthy adults who woke up feeling unrefreshed and gave them 120 mg a day of a root and leaf extract or a placebo for 6 weeks. On a restorative sleep questionnaire, scores improved by 72 percent with the extract and 29 percent with placebo. Wrist trackers also showed better sleep efficiency, longer total sleep, faster sleep onset and less wake time after falling asleep. The 2021 meta-analysis noted this trial was partly sponsored by the extract's manufacturer.

Kelgane 2020: adults over 65

The only sleep trial in older adults we found gave 50 people aged 65 to 80 either 300 mg of root extract twice a day or a placebo for 12 weeks (Kelgane and colleagues, 2020). On a 7-point sleep quality rating where lower is better, the ashwagandha group averaged 2.5 at week 12 against 4.3 with placebo, and they also felt more alert on waking. No participant reported an adverse event, though only 39 people finished the trial.

Fatima 2024: a second meta-analysis

A 2024 meta-analysis pooled 5 trials with 254 people who had anxiety, insomnia or both (Fatima and colleagues, 2024). It found significant effects in favor of ashwagandha on sleep onset, total sleep time, sleep efficiency and sleep quality scores, but not on time awake during the night or time in bed. The anxiety results varied enormously between trials, and the authors called for larger studies.

What Is the Latest Research on Ashwagandha?

Ashwagandha vs melatonin (2026)

The only head-to-head trial with melatonin we found randomized 200 adults aged 18 to 50 who took more than 30 minutes to fall asleep to root extract, 3 mg of melatonin after dinner, both, or a placebo for 8 weeks (Movva and colleagues, 2026). Measured by wrist tracker, time to fall asleep fell by 14.6 minutes with ashwagandha, 16.4 with melatonin, 20.9 with both and 7.2 with placebo. The authors described the two single treatments as moderate and comparable, and the paper reports no significant difference between them. Side effects were mild: about 6 percent of people on ashwagandha reported one, the same share as on placebo, against 10 percent on melatonin. Langade, who led the earlier insomnia trials, is one of the authors, and the extract was again supplied by its manufacturer.

Women after menopause (2026)

Many women sleep worse around menopause, and a 2026 trial tested ashwagandha in 66 women aged 45 to 65 (Obhrai and colleagues, 2026). After 12 weeks of 600 mg of root extract a day, Pittsburgh Sleep Quality Index scores improved by 5.2 points, against 0.8 points with placebo, and menopause symptom scores also fell more. It's one single-center trial, so it needs repeating before it says much about ashwagandha's benefits for women in general.

How Does Ashwagandha Compare With Sleep Habits and CBT-I?

Ashwagandha's sleep effect is real in these trials, but it's smaller and less proven than the treatment doctors recommend first. The American College of Physicians gives a strong recommendation that every adult with chronic insomnia start with cognitive behavioral therapy for insomnia, or CBT-I (Qaseem and colleagues, 2016). CBT-I is a structured program, usually spread over several weeks, that resets your sleep schedule, ties your bed to sleep and works on the worry that keeps you awake.

These numbers come from different trials with different people, so treat the comparison as a rough guide, not a ranking. The CBT-I figures come from a meta-analysis of 20 randomized trials with 1,162 adults with chronic insomnia, which compared CBT-I with inactive treatments (Trauer and colleagues, 2015). Sleep efficiency improved by about 10 percentage points. The American Academy of Sleep Medicine suggests that clinicians not use melatonin, valerian or L-tryptophan for chronic insomnia (Sateia and colleagues, 2017), and ashwagandha isn't among the treatments it recommends.

Daily habits matter too. Regular exercise improves sleep quality in meta-analyses of randomized trials, as our exercise and sleep research review explains, and our guide on how to fall asleep faster covers the bedtime techniques with the best evidence. If exercise is the habit you want to build, an AI personal trainer app can make it easier to keep. FitCraft's AI coaches build you a personalized plan around your goals, schedule and fitness level, demonstrate each exercise in interactive 3D and adapt your workouts as you progress.

How Does Ashwagandha Work for Sleep?

Nobody knows for sure. Researchers have three leading ideas, and none has been proven in people.

• Lower stress hormones. In 64 adults with chronic stress, 600 mg of root extract a day for 60 days lowered serum cortisol more than placebo did (Chandrasekhar and colleagues, 2012). Stress and poor sleep feed each other, and in the insomnia trials anxiety scores fell alongside the sleep gains.
• The brain's calming GABA system. In rodents, an enzyme-treated root extract lengthened sleep, increased deep non-REM sleep and raised brain levels of GABA, the calming chemical messenger that many sleep drugs act on (Park and colleagues, 2023).
• A compound in the leaves. In mice, a water extract of ashwagandha leaves increased non-REM sleep, and the active ingredient turned out to be triethylene glycol (Kaushik and colleagues, 2017). An alcohol extract rich in withanolides, the compounds supplements are usually standardized to, didn't induce sleep. Most human trials used root extracts, so it's unclear how much this finding applies to them.

Does Ashwagandha Make You Sleepy?

Not in the way a sleeping pill does. Drowsiness is listed as a possible side effect by the US National Center for Complementary and Integrative Health (NCCIH, 2023), but in the 200-person melatonin comparison only about 1 percent of participants reported it. People in the meta-analysis felt more alert on waking, not groggier. The sleep benefits in the trials appeared after weeks of daily use, not within hours of a dose, so a capsule tonight isn't likely to put you to sleep tonight.

Ashwagandha for Sleep Dosage: What the Trials Used

The sleep trials gave 120 to 600 mg a day of a concentrated, standardized extract for 6 to 12 weeks. Most used 600 mg of root extract a day, often split into two 300 mg doses.

Three points follow. No sleep trial tested more than 600 mg a day, so there's no evidence that a bigger dose works better. The doses refer to standardized extracts, so they don't carry over to raw root powder or to blends that mix ashwagandha with other herbs. And the meta-analysis's dose finding compared different trials rather than doses within one trial, so it's a hint, not proof. For the time of day, our guide on when to take ashwagandha covers what the trials did for sleep, stress and training.

Why Be Careful With Ashwagandha?

In the sleep trials, which lasted 12 weeks at most, side effects were few and mild: mostly nausea, headache and stomach upset. The concerns come from case reports, from groups the trials excluded and from how little is known about longer use.

• Liver injury. It's rare, but it's well documented. A 2026 scoping review found 25 patients in 13 published reports (McIntyre and colleagues, 2026). Twenty recovered after stopping, one needed a liver transplant, and three people who already had cirrhosis died. The injury usually appeared after weeks of use. Stop and see a doctor if your skin or eyes turn yellow, your urine turns dark or you start itching all over.
• Thyroid hormones. Ashwagandha can push thyroid hormone levels up. In 50 adults with mildly underactive thyroids, 600 mg a day for 8 weeks moved their thyroid tests toward normal compared with placebo (Sharma and colleagues, 2018). That same push can overshoot. A 73-year-old woman who took it for two years in place of her thyroid medicine developed an overactive thyroid and a racing heart rhythm, which settled within two weeks of stopping (Kamal and colleagues, 2022).
• Pregnancy and breastfeeding. NCCIH advises avoiding it during pregnancy and not using it while breastfeeding.
• Medicines. According to NCCIH, it might interact with sedatives, anti-seizure drugs, thyroid hormone, immunosuppressants and medicines for diabetes and high blood pressure. If you take a sleeping pill, that's the combination to clear with your doctor before you start.
• Other conditions. NCCIH doesn't recommend it before surgery or for people with autoimmune or thyroid disorders, and says people with hormone-sensitive prostate cancer should avoid it.
• Long-term use. NCCIH says it may be safe for up to 3 months, and there isn't enough information to judge longer use.

Why Don't Doctors Recommend Ashwagandha?

Many doctors hold back on ashwagandha for sleep for four reasons.

1. It isn't a guideline treatment. CBT-I is the first-line treatment for chronic insomnia, and neither the American College of Physicians nor the American Academy of Sleep Medicine recommends ashwagandha.
2. The evidence is thin and narrow. The trials are small, short and mostly from India, and several share authors and used extract donated by its manufacturer. Their objective measures came from wrist trackers, which estimate sleep from movement, and none of the trials reviewed here used an overnight sleep lab study.
3. Products vary. Dietary supplements aren't approved by the FDA before they're sold, according to NCCIH, and a product on a store shelf may not match the standardized extracts the trials used.
4. Poor sleep can have a cause that needs its own treatment. The 2019 insomnia trial excluded people with other sleep disorders and psychiatric illness. Sleep apnea, depression, restless legs or a medication side effect won't be fixed by an herbal extract.

Common Misconceptions

Misconception 1: "Ashwagandha works like a sleeping pill"

The trials tested weeks of daily use, not a single dose at bedtime, and they measured results after 6 to 12 weeks. Placebo groups improved too. In the 10-week insomnia trial, people taking placebo fell asleep 8 minutes faster by the end, which shows how much routine and expectation contribute to any sleep aid.

Misconception 2: "If 600 mg helps, more will help more"

No sleep trial went above 600 mg a day, and the meta-analysis's dose comparison came from different trials, not from testing doses against each other. Taking more adds uncertainty about the rare liver and thyroid problems, with no evidence of extra benefit. Stay within the studied range, and only with your doctor's approval.

Misconception 3: "It's natural, so it's safe"

Natural products can harm the liver, change hormone levels and interact with medicines, and ashwagandha has documented cases of all three. Being sold as a supplement also means no FDA review of safety or effectiveness before it reaches the shelf.

What the Research Suggests Going Forward

The evidence so far points in one direction: ashwagandha root extract modestly improves sleep onset, sleep efficiency and sleep quality over 6 to 12 weeks, more so in people with insomnia. Two meta-analyses and a 2026 head-to-head trial with melatonin agree on that.

The open questions are bigger than the answers. Nobody knows whether the benefit lasts beyond 12 weeks, whether daily use is safe for months or years, or whether the results hold up in larger trials run outside India by teams with no link to an extract maker. We found no trial that compared ashwagandha with CBT-I, measured sleep in an overnight sleep lab or tested people with sleep apnea or depression.

So if you want to try it, talk to your doctor first, use a studied dose for about 8 weeks, keep a simple sleep diary and stop if nothing changes. Put the basics first: a regular wake time, a dark and cool bedroom, regular exercise and, for insomnia that lasts, CBT-I, the treatment with the strongest evidence.

References

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