The menstrual cycle associated with insomnia in newly employed nurses performing shift work: a 12-month follow-up study

Insomnia is associated with a 3.05-fold increase in the prevalence of menstrual cycle irregularity among newly-employed shift-working nurses.

• A total of 287 nurses were followed for 12 months to examine the relationship between insomnia and menstrual cycle irregularity.
• Insomnia was linked to a 2.05-fold increase in the odds of newly developing menstrual cycle irregularity compared to those without insomnia.
• As insomnia severity increased, both the incidence and prevalence of menstrual cycle irregularity also tended to increase.
• The findings suggest that insomnia may play a significant role in menstrual dysfunction among shift workers, in addition to circadian rhythm disruptions.

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