The relationship between the lunar phase, menstrual cycle onset and subjective sleep quality among women of reproductive age

Yoko Komada*, Makoto Sato, Yuko Ikeda, Azusa Kami, Chika Masuda, Shigenobu Shibata

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The aim of the present study was to investigate the association among lunar cycle, menstrual cycle onset, and subjective sleep quality. Menstrual cycle onset data from the six most recent menstrual cycles were obtained for 529 women (aged 25–39 years) using the smartphone app Luna Luna. We also collected questionnaire survey data on sleep quality from each participant. Overall, there was no association between the onset of menstrual cycle and lunar phase. Interestingly, the proportion of good sleepers with menstrual cycle beginning during the light period was significantly higher than that during the dark period, while the proportion of poor sleepers with menstrual cycle beginning during the dark period was significantly higher than that during the light period. When participants were categorized by the combination of lunar phases (light, dark, neutral periods) in the two most recent menstrual cycle onsets, the “both dark period” group and the “other (light and dark) period” group showed the lowest proportion of good sleepers. Menstrual cycle onset in the dark period was associated with a deterioration in subsequent subjective sleep quality, which was more apparent with consecutive onsets in the dark period or at a rapidly changing lunar phase.

Original languageEnglish
Article number3245
Pages (from-to)1-13
Number of pages13
JournalInternational journal of environmental research and public health
Volume18
Issue number6
DOIs
Publication statusPublished - 2021 Mar 2

Keywords

  • Human
  • Lunar rhythms
  • Menstrual cycle
  • Menstruation
  • Moon
  • Reproductive health
  • Sleep quality

ASJC Scopus subject areas

  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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