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In this open-label study using final evaluator blinding, the efficacy of yokukansan (YKS) was evaluated in six psychophysiological insomnia patients using the cyclic alternating pattern (CAP) method. YKS had no influence on objective sleep parameters by the Rechtschaffen & Kales method, but the CAP rate and CAP cycle frequency decreased significantly. In the subjective Visual Analog Scale test,...
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