Objective: Examine the relationship between Premenstrual Syndrome (PMS) and sleep in different menstrual cycle phases.
Methods: Case-control survey conducted at the Primary Care Service and Clinical Research Center at Hospital de Clínicas de Porto Alegre with women aged between 18 and 45 years old. Women filled the Brazilian version of the Premenstrual Symptoms Screen Tool (PSST) for the screening of PMS; participants with positive screening completed the Daily Record of Severity of Problems (DRSP) to confirm PMS diagnosis. We applied the Pittsburg Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS) Brazilian versions in the luteal phase (LP) and follicular phase (FP).
Results and conclusion: 69 women were characterized with PMS and 52 without PMS. The risk of poor sleep quality (SQ) was two times higher in women with PMS (p = .006; OR = 3.057; IC95% 1.44-6.45). An interaction between no PMS and LP was found in ESS (p = .014; generalized estimating equation - GEE - adjusted for multiple comparisons by the Bonferroni test and adjusted by age); besides that, women with PMS had greater scores in ESS (p = .022; GEE adjusted by age).
Keywords: Premenstrual Syndrome; disorders of excessive somnolence; intrinsic; sleep; sleep disorder; sleepiness.