In this episode of unPAUSED, Dr. Mary Claire Haver sits down with Dr. Kristen Holmes, Vice President of Performance Science at Whoop and author of the new book Aligned, to unpack why sleep and circadian rhythm matter as much as hormones when it comes to the symptoms women feel in perimenopause and menopause.

Dr. Holmes explains the concept of circadian amplitude, the contrast between activity and rest, light and dark, and fed and fasted states that keeps every system in the body running on time, and why women with lower amplitude tend to report more frequent and more severe symptoms. She walks through why morning light exposure is one of the most powerful and underused tools available, how getting outside within the first part of the day sets the timing for melatonin release that night, and why a window is not a substitute for actual daylight.

The conversation moves into meal timing, including why the body is more insulin sensitive earlier in the day and how consolidating calories into a shorter window can support better sleep and metabolic health. Dr. Holmes also covers where movement fits, including the specific role of zone two training in recovery, why late night intense exercise can work against sleep, and how alcohol affects women differently than men at the same dose.

Dr. Holmes and Dr. Haver also dig into what actually drives a 3am wake up, tracing it back to progesterone, GABA signaling, and the loss of hormonal stability that comes with perimenopause, and why sedatives can mask the problem without improving sleep architecture. The conversation ends with a look at the data connecting circadian misalignment to shift work, mental health, and long term health risk, and what a woman can start doing tonight to build back that rhythm.

Guest links:

Dr. Kristen Holmes (Instagram)

Dr. Kristen Holmes, PhD (LinkedIn)

The Line with Dr. Kristen Holmes (Apple Podcasts)

Books

“The New Perimenopause,” by Dr. Mary Claire Haver

“The New Menopause,"⁠ by Dr. Mary Claire Haver

“Aligned: The Data-driven Guide to Performance, Recovery, and Human Potential,”

by Kristen Holmes