Circadian Rhythms in Pregnancy and Birth | Dr Max on Great Birth Rebellion Podcast
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Pregnancy and birth are deeply intertwined with circadian rhythms — not just for the mother, but for the developing fetus and newborn. Dr. Max Gulhane, a general practice registrar with expertise in circadian health, reveals that the body's internal clock, governed by light exposure, is a fundamental biological necessity — as essential as breathing. He explains how modern life, with its artificial lighting and late-night screen use, disrupts this delicate system, suppressing melatonin and impairing hormonal balance, sleep quality, and metabolic function. This disruption is especially dangerous during pregnancy, where it can contribute to gestational diabetes, fetal growth restriction, and even long-term epigenetic changes in the child. The solution? Simple but radical: prioritize bright morning sunlight, eliminate blue light at night, eat during daylight hours, and use warm, low-intensity lighting after sunset. These habits aren’t just about better sleep — they’re about optimizing fertility, labor progression, breastfeeding, and lifelong health. Max emphasizes that melatonin isn’t just a sleep hormone — it’s a powerful antioxidant and regulator of oxytocin, which explains why labor often begins at night and stalls in brightly lit hospital environments. The takeaway? Your body is engineered to thrive under natural light cycles — and ignoring them may be silently undermining your health, your pregnancy, and your child’s future.
Exposure to bright morning sunlight within 30 minutes of waking resets your circadian clock and boosts melatonin production for better sleep.
Blue light at night suppresses melatonin, disrupts oxytocin function, and can stall labor — especially in brightly lit hospital environments.
Eating during daylight hours and avoiding food after sunset aligns with your body’s natural metabolic rhythm and reduces risk of gestational diabetes.
Melatonin, secreted in darkness, acts as a powerful antioxidant and is crucial for fetal development, placental function, and infant sleep regulation.
Breast milk contains circadian hormones — nighttime milk is richer in melatonin and designed to promote infant sleep, so feed expressed milk at the time it was produced.
…and 3 more takeaways available in PodZeus
Sponsor: Hardblock Bitcoin Exchange
Sponsored by Hardblock, Australia's longest-running Bitcoin-only exchange, offering recurring purchases, Lightning Network, SMSF support, and an education platform at learn.hardblock.com.au. Listeners can claim $10 in Bitcoin using code REGENPOD.
Sponsor: Poppy Child & The Birth Box
Poppy Child, a doula and hypnobirth practitioner, sponsors the episode with her online course, The Birth Box, which offers practical strategies for birth preparation and parenting. Listeners get 25% off with code MELANIE.
Introduction to Circadian Rhythms and Light
Dr. Max Gulhane introduces circadian rhythms as a fundamental biological system governed by light. He explains how natural sunlight triggers the master clock in the brain, regulating melatonin and cortisol, and how modern artificial light disrupts this delicate balance.
The Body’s Internal Clocks and Light Sensitivity
Max details how the retina contains specialized cells (melanopsin) that detect blue light and signal the brain’s master clock. He explains the importance of contrast between bright daylight (up to 100,000 lux) and true darkness (0.001 lux) for optimal circadian health.
Circadian Rhythms and Female Reproductive Health
Max links circadian rhythms to the 28-day lunar cycle and menstrual regularity. He discusses how light pollution may disrupt ovulation and reproductive function, and how melatonin suppresses aromatase, reducing estrogen signaling and lowering breast cancer risk.
“When women go in and they're laboring and they're trying to make sure that their oxytocin system is working well, all of a sudden the melatonin levels are dropping because of their nighttime exposure to blue light.”
“The first thing I would advise people is to turn off overhead lighting. Next, use dim lighting the least amount that you need to get what you need done.”
“Your body has a natural circadian cycle that is triggered by your eyes' exposure to blue light. Historically, before electricity, that would have been governed by the sun, which was easy because we didn't have to do anything.”
Host
Guest
melatonin
other
Dr. Melanie Jackson
person
Dr. Max Gulhane
person
oxytocin
other
cortisol
other
pineal gland
other
placenta
other
Poppy Child
person
The Birth Box
product
Hardblock Bitcoin Exchange
organization
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