How Biological Rhythms Affect PMS and PMDD
Updated: Sep 25
PMS and PMDD are closely tied to the menstrual cycle, but reproductive hormones aren't the only rhythms researchers are paying attention to.
A 2024 systematic review looked at the relationship between biological rhythms and premenstrual syndrome (PMS) and premenstrual dysphoric disorder (PMDD). Across the studies reviewed, people with PMS or PMDD tended to have lower melatonin levels, higher nighttime body temperature, and poorer perceived sleep quality compared with those without PMS or PMDD. PubMed Central (PMC)
What do sleep and biological rhythms have to do with PMDD?
Melatonin helps regulate the sleep-wake cycle, while body temperature also follows a predictable daily rhythm. Both interact with the body's broader circadian system.
The review suggests that some of these rhythms may function differently in people with PMS and PMDD. Sleep was especially notable: participants with PMS or PMDD consistently reported poorer sleep quality, although findings from objective sleep measurements were more mixed. PubMed Central (PMC)
That doesn't mean poor sleep causes PMDD or that fixing sleep alone will treat it. PMDD is a complex mood disorder involving sensitivity to normal hormonal changes across the menstrual cycle. But sleep and circadian rhythms may be another useful piece of the picture, especially when symptoms seem to intensify at predictable points in the cycle.
Why recognizing the pattern matters
PMDD can affect mood, irritability, anxiety, concentration, energy, sleep, and day-to-day functioning. Because many of those symptoms overlap with other mental health conditions, the cyclical pattern can be an important clue. ACOG notes that PMDD symptoms occur before menstruation and significantly interfere with daily life, relationships, work, or other areas of functioning. ACOG
Tracking mood, sleep, and other symptoms across several menstrual cycles can help make those patterns easier to see and give you more useful information to discuss with a healthcare provider.
Research into biological rhythms and PMDD is still developing, but studies like this help broaden the conversation beyond individual symptoms and toward how sleep, circadian rhythms, reproductive hormones, and mental health may interact across the menstrual cycle.
