72 people with sleep problems took either a placebo or 200mg of valerian extract with 2% valerenic acid for 8 weeks in a double-blind study. Total scores on the Pittsburgh Sleep Quality Index improved significantly versus placebo. Valerian significantly improved sleep time and time to fall asleep compared to placebo as well as daytime drowsiness and waking up feeling refreshed. As a bonus, valerian also significantly improve anxiety.
Adv Ther. 2024; 41(1): 246–261.