A CASE OF INSUFFICIENT SLEEP SYNDROME

All night polysomnographic evaluation (PSG) soon after admission and a t the late period of admission revealed an atypically high sleep effic iency and a prolonged total sleep time. Sleep onset latency and distri bution of REM and NREM sleep stages were like those of normal sleepers . On REM latency, while it was remarkably reduced (25.0 min) soon afte r admission and sleep onset REM period (SOREMP) was found, at the late period of admission it was prolonged and SOREMP was not found. Giving multiple sleep latency test with polysomnography, soon after admissio n subjective excessive daytime sleepiness had already improved and mea n sleep latency (13.2 min) was within normal range. However, SOREMP ap peared twice in five tests. We considered that the appearance at the e arly period of admission was the result of REM pressure growing.