Measuring the sleepiness produced by secobarbital.
D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D010919:Placebos; D012631:Secobarbital / Q000097:blood / Q000494:pharmacology*; D012649:Self Concept; D012890:Sleep / Q000187:drug effects*; D012894:Sleep Stages; D014851:Wakefulness
D010919:Placebos; D012631:Secobarbital