Objects :The author tried to test the direct alcohol effect on the earlier part of sleep and the possible rebound changes in the later part of sleep in normal young adults. M ethods : The polysom nographic records of 14 normal Korean young adults after alcohol adm instrationC 1.5ml of 43% whisky perlkg of body weight) were com pared with the baseline records. Results : The alcohol administration did not change the sleep efficiency significantly, but shortened the latencies of sleep and stage 3 significantly. It also increased the percentage of stage 4 significantly in the first half of sleep, however, it did not change the REM sleep significantly. The alcohol decreased the frequency of body movem ent significantly in the first half of sleep. Conclusion : The amount of alcohol adm inistered in this study did not produce a significant effect on the sleep efficiency, however, the hypnotic effect and the effect of rapidly inducing slow wave sleep were evident The slow wave sleep ap peared to be more sensitive than REM sleep to the CNS depressant effect of alcohol. It may be inferred that REM sleep might have a biphasic effect by alcohol and an inverse relationship with slow wave sleep. The significant decrease of movement frequency in the first half reflected the direct effect of blood alcohol.
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