Across 3 studies, all reported beneficial effects on sleep quality. Effect sizes were mixed (small to large). The most studied dose range was 120-1000 mg/day, with median study duration of 56 days. Populations included healthy individuals and those with stress-related or clinical conditions (anxiety, insomnia, mental disorders).
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. Available evidence is overwhelmingly positive — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). Effect sizes varied substantially across studies (small to large).
No significant difference between Withania somnifera and the comparators was found for safety and tolerability.
from: The effect of Withania somnifera (Ashwagandha) on mental health symptoms in individuals wiimproved sleep quality
sleep parameters such as SOL, TST, PSQI, and SE, but not WASO and TIB
sleep quality (SMD: -1.35 (95% CI: -1.79; -0.91)