--- title: Does deep sleep work differently in the brain for women with PMDD? description: Yes, this tiny study found women with PMDD had different sleep wave patterns than healthy women across the whole menstrual cycle, but with only 6 women the re url: https://niyora.com/research/papers/altered-sleep-eeg-spectral-dynamics-across-the-menstrual-cycle-in-premenstrual-2026/ --- - [Niyora](https://niyora.com/) - [Research](https://niyora.com/research/) - [Library](https://niyora.com/research/library/) - Does deep sleep work differently in the brain for women with PMDD? Case-control study, 2026 # Does deep sleep work differently in the brain for women with PMDD? Yes, this tiny study found women with PMDD had different sleep wave patterns than healthy women across the whole menstrual cycle, but with only 6 women the result is very uncertain. Early or limited evidence 6 women with PMDD and 5 healthy women, studied across one full menstrual cycle ## What they did Researchers recorded brain activity during sleep (polysomnography) every third night for one full menstrual cycle in 6 women with PMDD and 5 healthy women, then compared their sleep wave patterns and linked them to body temperature, a melatonin marker, and self-reported mood and sleep quality. ## What they found In the PMDD group, theta waves dropped and 'spindle' brain activity rose from the follicular to the luteal (premenstrual) phase. Compared with healthy women, the PMDD group had about 60% higher spindle activity and more spindles in both phases, but about 40% lower slow wave activity (deep sleep signal). Lower slow wave activity tracked with the melatonin marker and sleep quality; higher spindle activity tracked with body temperature and mood symptoms. ## What it means for you This suggests PMDD may involve real changes in how the brain organizes sleep, not just how someone feels about their sleep. The sample is extremely small (6 vs 5 women), so these findings need to be confirmed in larger studies before they can guide treatment. 6 / 5 Women with PMDD / controls ~60% Higher spindle activity in PMDD ~40% Lower slow wave activity in PMDD ## About the study Original title Altered sleep EEG spectral dynamics across the menstrual cycle in premenstrual dysphoric disorder Authors Moderie C, Boudreau P, Pérez Medina Carballo R et al. Journal Sleep medicine Year 2026 Study design Case-control study What was tested No treatment tested; this was an observational sleep-recording study Open access Yes Read the paper [doi.org/10.1016/j.sleep.2025.108679](https://doi.org/10.1016/j.sleep.2025.108679) Original abstract Introduction: Premenstrual Dysphoric Disorder (PMDD) is frequently associated with luteal-phase (LP) insomnia. Although the mechanisms underlying insomnia remain unclear, prior evidence suggests paradoxically increased N3 sleep in PMDD across the menstrual cycle. This study investigated potential alterations in sleep microarchitecture in women with PMDD. Methods: Six women diagnosed with PMDD (32.0 ± 5.7years), along with five healthy controls (30.4 ± 8.2 years) completed polysomnographic sleep recordings (PSGs) every third night throughout one menstrual cycle. EEG spectral analysis (C3-A2) was performed on NREM sleep using Fast Fourier Transform with a 4-s Hamming window and 50 % overlap, and a sleep spindle detector was used. Within-group changes were reported relative to the follicular phase (set at 100 %), and between-group differences relative to controls (set at 100 %), with 95 % confidence intervals for significance. Mixed-model ANOVA was used for spindles parameters. Correlations examined the relationships among EEG frequency bands, core body temperature (Tcore), urinary 6-sulfatoxymelatonin (aMT6), and self-reported mood and sleep quality. Results: Relative to their FP, the PMDD group showed decreased theta and increased spindle frequency activity (SFA) in the LP. Between-group comparisons indicated higher SFA (∼60 %) and spindle density in PMDD across both phases, as well as lower slow wave activity (SWA; ∼40 %). Moreover, SWA correlated with aMT6 and subjective sleep quality, while elevated SFA was associated with Tcore and mood symptoms. Conclusions: This study revealed alterations in sleep microarchitecture in PMDD, particularly regarding spindle activity and SWA. The previously observed increase in N3 sleep may reflect a compensatory mechanism in response to disrupted homeostatic processes, warranting further investigation into targeted interventions for insomnia in PMDD. Reproduced under CC-BY. ## Topics [Premenstrual dysphoric disorder (PMDD)](https://niyora.com/research/topics/condition-pmdd/)[Low mood and depression](https://niyora.com/research/topics/symptom-depression-mood/)[Sleep and insomnia](https://niyora.com/research/topics/symptom-sleep/) Research tells you what helps on average. Niyora helps on the day it hits. Calm down, see it another way, and decide what to say, with a PMS and PMDD app built by a doctor. ## Related studies Review, 2024 What do brain wave patterns show about PMS and PMDD? Survey study, 2026 What lifestyle and work factors are linked to PMDD symptoms in Chinese nurses? Cohort study, 2026 What life and psychological factors are linked to PMS and PMDD? Survey study, 2025 Does PMDD affect screen time, sleep quality, and how fast people react? Survey study, 2025 Are premenstrual dysphoric disorder symptoms, stress, and sleep quality linked in female nursing students? Systematic review, 2024 Do women with PMS or PMDD have disrupted body clocks and sleep? Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗