Planta Med 1985; 51(2): 144-148
DOI: 10.1055/s-2007-969430
Research Articles

© Georg Thieme Verlag Stuttgart · New York

Aqueous Extract of Valerian Reduces Latency to Fall Asleep in Man

P. D. Leathwood, F. Chauffard
  • Research Department, Nestlé Products Technical Assistance Co. Ltd., CH-1814 La Tour de Peilz, Switzerland
Further Information

Publication History



Publication Date:
26 February 2007 (online)


A group of 8 volunteers suffering from mild insomnia received a placebo, 450 mg or 900 mg of an aqueous extract of valerian root in a double-blind, repeated measures, random-order design. Subjective sleep ratings were assessed by questionnaire and movements were recorded throughout the night with wrist-worn activity meters. Using the first period of 5 consecutive minutes without movement as a criterion of sleep onset, there was a significant decrease in sleep latency with 450 mg valerian compared to placebo (15.8 ± 2.2 min vs 9.0 ± 1.5 min; paired “t” = 3.37;p < 0.01). The higher dose of valerian produced no further improvement in sleep latency.