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. 2022 Apr 8;14:491–503. doi: 10.2147/IJWH.S341917

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© 2022 Alzueta et al.

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Main sleep features tracked with the Oura ring during four phases of the menstrual cycle (Menses, Ovulation, Midluteal and Late luteal) in healthy, reproductive-aged women (n = 26). Sleep measures included Total Sleep Time (A), Sleep efficiency (B), Sleep Onset Latency (C) Wake After Sleep Onset (D), Deep sleep (E), Light sleep (F), and Rapid-Eye-Movement (REM) sleep (G). The only menstrual cycle phase-related difference was in sleep efficiency (B), which was marginally lower in the midluteal phase compared with menses.