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. 2010 May 1;33(5):647–656. doi: 10.1093/sleep/33.5.647

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© 2010 Associated Professional Sleep Societies, LLC.

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Variation of wake after sleep onset (WASO), slow wave sleep (SWS), and REM sleep across thirds of the nocturnal sleep period (SP; from sleep onset to final awakening) in the MF and ML phases of the menstrual cycle. Amounts per third were expressed as % of the full SP. A significant main effect of time within the SP was observed for SWS % and REM sleep % (P < 0.01), and a significant main effect of menstrual phase was observed for REM sleep % (P = 0.035), by 2-way ANOVA for repeated measures. Values are mean ± SEM.