Effects of a Valerian-Hops Extract Combination (Ze 91019) on Sleep Duration and Daytime Cognitive and Psychological Parameters in Occasional Insomnia: A Randomized Controlled Feasibility Trial.

Consistent with the prolongation of total sleep duration in the shortest night, a nominally significant effect was also seen for the total duration in bed during the night ( p = 0.015, r = 0.40) with an estimated increase in time in bed of 0.99 h (59 min) in the verum group compared to the placebo group (Table 2 ).

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