Circadian Rhythm & Sleep Health Tips

Circadian Rhythm & Sleep Health Tips

Raena

What are Melatonin and the Circadian Rhythm?

The production of melatonin, often referred to as our sleep hormone, increases with evening darkness and is a central part of our body's sleep-wake cycles. The circadian period of sleep/wake is around 24.2 hours, and there are many endogenous and exogenous factors that can shift a circadian rhythm. Cortisol and melatonin are inversely related; cortisol peaks highest in the morning and melatonin is highest in the evening.

Reasons You Can’t Fall Asleep:

  • Anxiety/stress

  • Low melatonin levels

  • Excess light/electronic stimulation

  • Hormonal imbalances

  • Medication/caffeine stimulation

  • Neurotransmitter imbalances

Reasons You Can’t Stay Asleep:

  • Cortisol (stress hormone) spiking in the middle of the night — you might feel ‘wired but tired’

  • Dysregulation of body temperature due to hormonal imbalances

  • Blood sugar fluctuations

  • Low oxygen levels

  • Liver health issues

Sleep Hygiene Tips:

  • Keep regular bedtimes and wake times, even on weekends to train your biological clock.

  • Avoid alcohol within 3 hours of bedtime.

  • Avoid caffeine after 2 pm. Some individuals may be more sensitive — limit caffeine intake before noon. This includes beverages, chocolate, etc.

  • Complete aerobic or high-intensity interval training before 6 pm.

  • Use the bedroom only for sleep and sex — not for watching TV or eating.

  • Avoid watching stressful or negative content before bed.

  • Journal your thoughts prior to bedtime.

  • Aim for consistent bedtime between 10–11 pm; this is associated with a decreased risk of developing heart disease.

  • Incorporate breathing exercises, calming sounds, or meditation before bed. Apps like Calm, Headspace, and Insight Timer can help.

  • Consider Epsom salt baths to reduce muscle tension and promote relaxation.

  • Avoid large meals and finish eating at least 3 hours before bed.

  • Get regular outdoor light exposure — watch the sunrise and sunset to regulate circadian rhythm.

  • Avoid sleeping near electromagnetic fields (EMFs) — including electrical outlets, phones, and electronics.

  • Maintain a comfortable room temperature — ideally around 65°F to promote REM sleep.

  • Avoid blue light before bed — turn down screen brightness, use apps like f.lux, or wear blue light glasses.

Citations:

  • Arendt J, Skene DJ. Melatonin as a chronobiotic. Sleep Med Rev. 2005;9:25-39.

  • Monk TH. Enhancing circadian zeitgebers. Sleep. 2010;33(4):421-422. doi:10.1093/sleep/33.4.421

  • Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. J Physiol Anthropol. 2012;31(1):14. doi:10.1186/1880-6805-31-14

  • Oster H, et al. The Functional and Clinical Significance of the 24-Hour Rhythm of Circulating Glucocorticoids. Endocr Rev. 2017;38:3–45.

  • Nikbakhtian S, et al. Accelerometer-derived sleep onset timing and cardiovascular disease incidence: a UK Biobank cohort study. Eur Heart J - Digital Health. 2021;2(4):658–666. https://doi.org/10.1093/ehjdh/ztab088

  • Zisapel N. New perspectives on the role of melatonin in human sleep, circadian rhythms and their regulation. Br J Pharmacol. 2018;175(16):3190-3199. doi:10.1111/bph.14116

Disclaimer: This content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified healthcare provider with any questions regarding a medical condition or treatment. Never disregard professional medical advice or delay in seeking it because of something you have read on this website.

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