the present report systematically documents epochs of muscle atonia
in NREM sleep (MAN). Although their most frequent occurrence is in proximity to REM sleep, they are present throughout a NREM sleep episode. This gives rise to a Ushaped pattern. The present observations are in accordance with previous reports that epochs with a low EMG level occur in the part of the NREM sleep that precedes and follows REM sleep (4, 5, 12). These findings indicate that a REM sleep episode is not sharply delimited but that it has antecedents during NREM sleep and that it vanishes gradually in the succeeding NREM sleep episode.
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