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. 2008 May 1;31(5):691–699. doi: 10.1093/sleep/31.5.691

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© 2008 Associated Professional Sleep Societies, LLC.

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(A) Representative data from a rat on postnatal day (P)11 depicting 2 sleep-wake cycles. The top trace depicts neocortical electroencephalogram (EEG) activity and the bottom trace depicts nuchal electromyogram (EMG) activity. Behavioral states are indicated beneath each EMG trace (W: wakefulness; QS: quiet sleep; AS: active sleep). The first sleep period is designated “QS-only” as the single bout of QS transitions directly back into W. The second sleep period is designated “QS-AS” as it is composed of an initial bout of QS (QS1) followed by at least 1 bout of active sleep (AS). (B) Mean proportion of sleep periods consisting of QS-only (white bars) or QS-AS (black bars) bouts. *Significantly different from QS-AS. (C) Mean durations of QS-only (white bars), QS1 (hatched bars), and QS-AS (black bars) bouts. ^†Significantly different from other 2 bout types. Mean + SEM.