Women With Ovulatory Cycles Have Longer Sleep, but Phases of Their Menstrual Cycles Do Not Differ in Sleep Characteristics.
Wachowicz A; Galbarczyk A; Marcinkowska UM; Ozdemir S; Klimek M; Tubek-Krokosz A; Słojewska K; Krzych-Miłkowska K · 2026 · American journal of human biology : the official journal of the Human Biology Council
WASTE classifies this as Negative / Null Result Report · AI classification, approximate
The study found no significant effect — useful as a negative control or null benchmark for your own design.
Abstract (excerpt)
Objectives Duration and quality of sleep are influenced by many factors, including hormonal changes. The aim of this study was to investigate the differences between the phases of the menstrual cycle in total sleep duration and sleep stage…
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Metadata source: Europe PMC · DOI 10.1002/ajhb.70247