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This study investigated the effects of placebo, 1 mg, 3 mg, 10 mg and 30 mg ritanserin and 10 mg diazepam on human sleep. Twelve normal volunteers participated in this randomized, double-blind, placebo-controlled cross-over sleep study. A clear dose-response relationship was found for ritanserin with higher doses evoking increased duration of slow wave sleep.
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Idzikowski et al. (1991) studied this question.
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