Can Ashwagandha Help With Sleep? What the Research Shows
- Stress & Mood Research Series
- By Purple Iris Media
- Published Oct 2025
- Updated Sep 2026
- 6 min read
Sleep advice can become frustrating fast. One source says to take something at night, another promises deeper sleep, and product pages often make the evidence sound more certain than it is.
If you’re wondering whether ashwagandha is worth considering for sleep, the research is promising, but still limited. One trial studied a standardized root extract in healthy adults and adults with insomnia [1]. Another examined a different extract in healthy adults who reported nonrestorative sleep [2]. Because the products and participants differed, their results should not be treated as a guarantee for every supplement or every person.
A 2021 review combined five randomized trials and found a small improvement in overall sleep measures compared with placebo [5]. The studies differed in their extracts, amounts, durations, and participant groups, and questions about long-term safety remain.
In this guide, we’ll look at what the studies actually measured, what they can reasonably tell us, and where uncertainty remains. The goal is to make the research easier to understand—not to prescribe a treatment, dose, or schedule.
Purple Iris Media is an evidence-informed wellness publisher, not a medical provider. This article explains how ashwagandha has been studied for sleep and does not recommend it as a treatment for insomnia or another sleep disorder.
Ashwagandha may cause drowsiness or digestive symptoms, and rare cases of liver injury have been reported. Long-term safety has not been established. It should be avoided during pregnancy and breastfeeding and may not be appropriate before surgery or for people with autoimmune or thyroid disorders. Ashwagandha can also interact with certain medications [8]. Talk with a qualified healthcare professional before use if you have a health condition, take medication, or have questions about whether it is appropriate for you.
Key Takeaways
- Promising, not conclusive: Five randomized trials included in a 2021 review found a small improvement in overall sleep measures, but the studies were limited and varied.
- Extracts matter: The trials used specific standardized extracts. Their findings should not automatically be applied to every ashwagandha product.
- No universal routine: Studies used different amounts, schedules, and durations. They do not establish one best dose or time of day for everyone.
- Safety still matters: Ashwagandha may cause drowsiness or digestive symptoms and can interact with medications or be unsuitable in certain circumstances.
How Ashwagandha Sleep Research Was Designed
Sleep studies do not all ask the same question. They have used different extracts, participant groups, schedules, study lengths, and ways of measuring sleep. Those differences affect what each result can reasonably tell us.
DISCOVER
Study Design and Participants
Who participated, which extracts were tested, and how long the trials lasted.
EXAMINE
Sleep Outcomes
What researchers measured, including sleep quality, sleep onset, sleep efficiency, and alertness on waking.
UNDERSTAND
Research Limits and Practical Use
Why results from specific study routines do not establish one approach for every person or product.
How the Cited Sleep Studies Were Designed
The cited studies did not test one shared ashwagandha routine. They included different participant groups, extracts, daily amounts, study lengths, and sleep measurements.
POPULATION CONTEXT
Participants included healthy adults reporting nonrestorative sleep, adults diagnosed with insomnia, and a study group divided between healthy adults and adults with insomnia [1] [2] [4].
INTERVENTION CONTEXT
The five trials included in the systematic review used capsules containing either KSM-66 root extract or Shoden root-and-leaf extract. Daily amounts ranged from 120 to 600 mg, and the studies lasted from six to twelve weeks [5].
OUTCOMES FOCUS
Researchers used sleep questionnaires and wrist-based activity monitors to examine sleep quality, time to fall asleep, total sleep time, waking after sleep onset, sleep efficiency, and alertness upon waking [5].
What this means: These differences matter. A finding from one extract, participant group, or study schedule should not automatically be applied to a different product or person. Wrist-based activity monitors also estimate sleep and wake patterns from movement; they do not directly measure sleep in the same way as an overnight laboratory sleep study [5].
What the Studies Measured and Found
Sleep is not measured with one simple number. Researchers looked at several separate outcomes: how long it took participants to fall asleep, how long they slept, how often they were awake after initially falling asleep, how efficiently they used their time in bed, and how they rated their sleep and alertness the next morning.
An eight-week trial involving 80 healthy adults and adults with insomnia reported changes in several sleep measures, with more pronounced improvements among participants with insomnia [1].
A separate six-week trial studied 150 healthy adults who reported nonrestorative sleep. Researchers reported changes in self-rated sleep quality as well as activity-monitor estimates of sleep onset, total sleep time, waking after sleep onset, and sleep efficiency [2].
In another trial, 60 adults with insomnia and anxiety were studied for ten weeks. The ashwagandha group had a shorter average time to fall asleep and better sleep-efficiency and sleep-quality measures than the placebo group [4].
When researchers combined five randomized trials involving 400 participants, they found a small overall improvement in sleep measures compared with placebo [5]. Pooled results favored ashwagandha for several outcomes, including sleep onset, total sleep time, waking after sleep onset, and sleep efficiency. However, the review did not find a statistically clear improvement in every measure, including the Pittsburgh Sleep Quality Index or total time in bed [5].
Practical interpretation: That mixed pattern matters. The research suggests that specific ashwagandha extracts may affect selected sleep measures, but it does not show that every aspect of sleep improves—or that every person or product will produce the same result.
What the Research Means for Practical Use
It can be tempting to turn a study schedule into a simple formula: take a certain amount at bedtime and expect a result within a set number of weeks. The cited research does not support that shortcut.
The trials used different standardized extracts, daily amounts, schedules, and study lengths. Across the five trials reviewed, daily amounts ranged from 120 to 600 mg and study periods ranged from six to twelve weeks [5]. One trial used a once-daily schedule [2], while another divided the studied amount into two daily servings [4].
These studies did not directly compare morning use with evening use. They also did not establish that taking ashwagandha 30 to 60 minutes before bed works better, that taking it with food improves absorption or effectiveness, or that everyone should expect a change within the same timeframe.
Research involving stress responses and laboratory models has explored cortisol- and GABA-related pathways, but that evidence does not confirm that ashwagandha affects human sleep through one established mechanism [3] [6] [7].
What this means: The study routines tell us what researchers tested—not what every person should do. Follow the directions and warnings for the specific product, and do not divide, combine, or increase servings solely to imitate a study. A qualified healthcare professional can help when product directions are unclear or individual health considerations are involved.
Continue Exploring Ashwagandha
These related guides can help you compare product characteristics or examine how ashwagandha was used in the cited research.
Compare Ashwagandha Products
See how five products differ in extract type, serving size, standardization, label information, and practical considerations.
Explore the Ashwagandha Supplement Guide →
Examine Timing and Practical Use
Review how different extracts, daily amounts, and schedules were used—and what the research has not established.
Explore How and When to Take Ashwagandha →
The Bottom Line
The cited research suggests that specific standardized ashwagandha extracts may modestly affect selected sleep measures in some adults. Individual trials studied different participant groups and routines [1] [2] [4]. A 2021 review found a small overall improvement across five randomized trials, but not every sleep measure showed a clear difference from placebo [5].
That makes ashwagandha a subject worth watching—not a proven sleep treatment or a universal solution. The research does not establish one best product, serving amount, time of day, or timeframe for noticing a result.
If you are considering a product, follow its directions and warnings rather than copying a study schedule. Speak with a qualified healthcare professional if you have a health condition, take medication, or have ongoing sleep concerns [9].
Common Questions
Why do the extract details matter in sleep studies?
The cited sleep studies did not all use the same ashwagandha preparation. The systematic review included KSM-66, a root extract, and Shoden, a root-and-leaf extract [5]. These extracts differed in composition, daily amount, and study schedule.
The studies did not directly compare KSM-66 with Shoden, so they do not establish that one is better for sleep. Findings from one standardized extract should not automatically be applied to another product.
When comparing products, look for the named extract, plant parts used, serving amount, standardization information, and the sleep outcome actually examined.
Can ashwagandha interact with medications or supplements?
Ashwagandha may interact with medicines used for diabetes or high blood pressure, immunosuppressants, sedatives, anti-seizure medicines, and thyroid hormone medications [8].
Information about combining ashwagandha with other dietary supplements is more limited. Because supplement ingredients and amounts vary, the cited research does not establish that every combination is safe.
Talk with a qualified healthcare professional or pharmacist before using ashwagandha if you take medication, use multiple supplements, or have questions about a particular combination.
Can I become dependent on ashwagandha?
The cited trials were not designed to determine whether ashwagandha causes dependence or withdrawal. They evaluated relatively short periods of use, generally ranging from six to twelve weeks [5].
NCCIH notes that ashwagandha may be safe for short-term use—up to about three months—but there is not enough information to draw conclusions about its long-term safety [8]. That does not establish that dependence is impossible.
If you have used ashwagandha regularly and are concerned about stopping it, speak with a qualified healthcare professional rather than relying on the study timelines alone.
Will ashwagandha make me feel groggy in the morning?
Ashwagandha may cause drowsiness in some people [8]. Although the cited sleep research included measures related to alertness upon waking, the findings do not establish that every person will wake feeling refreshed or avoid morning grogginess [2] [5].
Responses may differ depending on the person, product, serving amount, schedule, and other medications or supplements being used. If you experience unwanted drowsiness, stop using the product and speak with a qualified healthcare professional rather than changing the serving amount independently.
References
[1] Langade, D., Thakare, V., Kanchi, S., & Kelgane, S. (2021). Clinical evaluation of the pharmacological impact of ashwagandha root extract on sleep in healthy volunteers and insomnia patients: A double-blind, randomized, parallel-group, placebo-controlled study. Journal of Ethnopharmacology, 264, 113276.
https://doi.org/10.1016/j.jep.2020.113276
[2] Deshpande, A., Irani, N., Balkrishnan, R., & Benny, I. R. (2020). A randomized, double-blind, placebo-controlled study to evaluate the effects of ashwagandha (Withania somnifera) extract on sleep quality in healthy adults. Sleep Medicine, 72, 28–36.
https://doi.org/10.1016/j.sleep.2020.03.012
[3] Chandrasekhar, K., Kapoor, J., & Anishetty, S. (2012). A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian Journal of Psychological Medicine, 34(3), 255–262.
https://doi.org/10.4103/0253-7176.106022
[4] Langade, D., Kanchi, S., Salve, J., Debnath, K., & Ambegaokar, D. (2019). Efficacy and safety of ashwagandha (Withania somnifera) root extract in insomnia and anxiety: A double-blind, randomized, placebo-controlled study. Cureus, 11(9), e5797.
https://doi.org/10.7759/cureus.5797
[5] Cheah, K. L., Norhayati, M. N., Husniati Yaacob, L., & Abdul Rahman, R. (2021). Effect of ashwagandha (Withania somnifera) extract on sleep: A systematic review and meta-analysis. PLOS ONE, 16(9), e0257843.
https://doi.org/10.1371/journal.pone.0257843
[6] Russell, G., & Lightman, S. (2019). The human stress response. Nature Reviews Endocrinology, 15(9), 525–534.
https://doi.org/10.1038/s41574-019-0228-0
[7] Candelario, M., Cuellar, E., Reyes-Ruiz, J. M., Darabedian, N., Feimeng, Z., Miledi, R., Russo-Neustadt, A., & Limon, A. (2015). Direct evidence for GABAergic activity of Withania somnifera on mammalian ionotropic GABA<sub>A</sub> and GABAρ receptors. Journal of Ethnopharmacology, 171, 264–272.
https://doi.org/10.1016/j.jep.2015.05.058
[8] National Center for Complementary and Integrative Health. (n.d.). Ashwagandha: Usefulness and safety. National Institutes of Health.
https://www.nccih.nih.gov/health/ashwagandha