The Hormone That Tells Your Body It Is Night
You lie awake, mind racing, watching the hours tick by. Or you fall asleep easily but wake at 3am, unable to return to sleep. Sleep disorders are epidemic in modern society, and the consequences – for health, cognition, mood, and longevity – are profound. At our practice in Zürich Seefeld, I take sleep seriously and investigate the root causes of poor sleep rather than simply prescribing sleeping pills.
Melatonin, your body’s natural sleep hormone, is at the centre of healthy sleep – and understanding how it works opens the door to effective, natural sleep support.
How Melatonin Works
Melatonin is produced by the pineal gland in response to darkness. It does not make you sleep – rather, it signals to your body that it is night-time, reducing alertness and preparing your systems for rest. Melatonin production typically begins in the early evening, peaks between 2-4am, and falls to negligible levels by morning. This rhythm is controlled by your circadian clock and is exquisitely sensitive to light exposure.
What Disrupts Melatonin Production?
Blue light exposure: Screens (phones, tablets, computers, televisions) emit blue wavelength light that suppresses melatonin production even at moderate intensities. Evening screen use is one of the most common causes of delayed sleep onset.
Irregular sleep schedules: Shifting your sleep-wake times confuses the circadian clock and disrupts melatonin timing.
Age: Melatonin production naturally declines with age, contributing to the sleep difficulties common in older adults.
Shift work: Working against your circadian rhythm fundamentally disrupts melatonin patterns.
Caffeine: Consumed late in the day, caffeine both blocks adenosine (the sleep pressure signal) and may suppress melatonin production.
Stress: Elevated cortisol in the evening directly suppresses melatonin release, explaining why stress and insomnia so often coexist.
Beyond Melatonin: Other Causes of Poor Sleep
While melatonin disruption is common, I also investigate other causes: sleep apnoea, restless legs syndrome, thyroid dysfunction, magnesium deficiency, iron deficiency, blood sugar dysregulation (nocturnal hypoglycaemia can cause 3am awakenings), hormonal changes (particularly in perimenopause), anxiety and depression, and medication effects.
Our Assessment
I take a detailed sleep history, assess sleep hygiene, screen for sleep apnoea and restless legs, and check relevant blood work: thyroid function, iron/ferritin, magnesium, vitamin D, cortisol rhythm, and blood sugar. For persistent insomnia, sleep study referral may be appropriate.
What We Do: Restoring Natural Sleep
Sleep hygiene optimisation: Practical, evidence-based strategies: consistent sleep-wake times, blue light reduction in the evening, cool bedroom temperature, dark environment, and a wind-down routine.
Light therapy: Morning bright light exposure (15-30 minutes) helps anchor the circadian rhythm and improves melatonin timing.
Melatonin supplementation: When appropriate, low-dose melatonin (0.5-3 mg) timed correctly can be effective. I prefer prolonged-release formulations for patients who struggle with sleep maintenance.
Magnesium supplementation: Magnesium glycinate before bed supports GABA activity and muscular relaxation, improving sleep quality.
Address cortisol dysregulation: Evening stress management techniques, adaptogens, and lifestyle modifications to reduce cortisol interference with sleep.
CBT-I referral: Cognitive Behavioural Therapy for Insomnia is the gold standard treatment for chronic insomnia and is more effective than medication long-term.
Conclusion
Good sleep is not a luxury – it is a biological necessity. If you are struggling with sleep, a thorough evaluation at our practice in Zürich Seefeld can identify the specific factors disrupting your rest and guide you toward truly restorative sleep.
