Melatonin

By Sophora Health Editorial Team  ·  Medically reviewed  ·  Published July 2026  ·  Last reviewed July 2026

There was a time when sleep was something you did not think about. You went to bed, you slept, you woke up. Somewhere in your 40s that changed. Now you lie there for a while first. Or you fall asleep fine but wake at 3am and cannot get back. Or you sleep the hours but wake up tired, as if the sleep did not do what sleep is supposed to do. Melatonin is not the only reason this is happening, but it is one of the reasons nobody told you about. And it connects to everything else that is shifting hormonally right now in ways worth understanding.

What does melatonin have to do with perimenopause?

What melatonin is actually doing

Melatonin is produced by the pineal gland, a small structure deep in the brain, in response to darkness. As evening arrives and light reduces, melatonin production ramps up. It creates the physiological signal that drives sleepiness and prepares the body for the nightly repair processes that only happen during sleep. During the night, melatonin levels peak and then gradually fall as morning approaches, which is part of what produces natural waking.

But melatonin does more than produce drowsiness. It regulates the circadian rhythm, the 24-hour internal clock that coordinates dozens of biological processes including body temperature, immune function, hormone release, and cellular repair. When melatonin levels are adequate and well-timed, this clock runs smoothly. When melatonin declines or its timing shifts, the clock becomes less reliable. The result is not just poor sleep at night but a general desynchronisation that affects how you feel throughout the day.

Perimenopause adds two specific disruptions on top of the age-related decline. Oestrogen modulates serotonin, the neurotransmitter that acts as a direct precursor to melatonin. When oestrogen drops, serotonin production becomes less reliable, and less serotonin means less raw material for melatonin synthesis. Meanwhile, progesterone decline reduces GABA activity in the brain, the nervous system’s primary quietening chemical, which compounds the difficulty of settling into deep sleep even when melatonin is present. The three systems, melatonin, oestrogen, and progesterone, are all working on sleep at the same time. When two of them are in decline, the third cannot carry the load alone.

Sleep did not stop working. The hormonal signal that was telling the brain it was time to sleep has weakened. Those are different problems, and they have different solutions.

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What this actually looks like in practice

Melatonin disruption during perimenopause produces distinct sleep profiles depending on where in the night the disruption hits most. Some women develop earlier evening sleepiness and then wake prematurely in the early morning, the circadian rhythm shifting forward as melatonin peaks and falls too early. Others find the sleep cycle becomes fragmented, with frequent wakings and a loss of the deep slow-wave sleep that leaves you feeling genuinely rested rather than just having been horizontal for eight hours.

The fragmentation is often what is most distressing. A total of six hours of fragmented sleep produces far more fatigue and cognitive impairment than six hours of consolidated sleep. The body does the important work, memory consolidation, cellular repair, immune activity, during the deeper stages of sleep. When melatonin decline means the brain spends more time in lighter sleep stages or in wakefulness, those processes are disrupted even if the total hours in bed look adequate on paper.

Sleep and menopause look different around the world

Melatonin declines in every woman who ages. How the sleep disruption of menopause is experienced, reported, and treated varies significantly by ethnicity and cultural context.

Research has found that while women of white or Asian descent tend to experience more disturbed sleep during perimenopause and postmenopause, Hispanic women do not see the same change to the same degree. African American women in the SWAN study reported the highest rates of sleep difficulty. Sleep disruption in this group was more strongly tied to depression and stress than in other ethnic groups. The mechanisms behind these differences are not fully understood, but they highlight that melatonin decline alone is not the complete explanation for perimenopause sleep disruption. Cultural stressors, socioeconomic factors, and access to healthcare all shape how sleep symptoms are experienced and how likely they are to be addressed.

In East Asian traditional medicine, sleep disruption during the menopausal transition is understood as a disturbance of the shen. The shen is the spirit that resides in the heart and requires calm, adequate blood, and proper yin to settle at night. When those conditions are disturbed, sleep cannot come easily. A 2024 systematic review and meta-analysis found that East Asian herbal medicine, alone or combined with conventional treatment, may be effective and safe for improving sleep quality during menopause. The evidence is moderate and the populations studied are predominantly East Asian, but the finding reflects centuries of targeted attention to this specific problem in these traditions.

Valerian root, used in European herbal medicine for centuries including extensively in German and Swiss traditional practice, acts on GABA receptors in the brain in a mechanism similar to how progesterone does. Studies on valerian alone show mixed results. A systematic review of herbal sleep aids found that valerian combined with hops, passionflower, and lemon balm produces more consistent improvements in sleep onset and quality. These combinations are widely used in Continental European botanical medicine and increasingly studied in clinical settings.

In South American indigenous tradition, passionflower has been used as a calming and sleep-promoting herb for centuries. It contains GABA-active compounds and has clinical trial evidence for reducing sleep onset time and nighttime anxiety. Tart cherry, consumed as juice in North American and increasingly European contexts, contains natural melatonin precursors and has small-study evidence for increasing total sleep time and improving sleep efficiency.

In many African traditional medicine contexts, sleep disturbance during midlife is addressed through warming herbal teas, lifestyle adjustments, and the social frameworks that reduce the nocturnal arousal that isolated, high-stress living amplifies. The role of community and relational warmth in sleep quality is documented in cross-cultural sleep research and is worth naming alongside the biochemical picture.

What actually helps

Address the hormonal root first

Melatonin supplements address the signal. HRT addresses the reason the signal has weakened. For many women, restoring oestrogen and progesterone through HRT improves sleep quality by removing two of the three factors disrupting it. Micronised progesterone taken at bedtime has specific evidence for improving sleep onset latency through its GABA-modulating effect. For women where HRT is appropriate, it is worth trying before accumulating a long list of supplements.

Melatonin supplementation

Low-dose melatonin supplementation, typically 0.5 to 2mg taken 30 to 60 minutes before intended sleep time, can help re-anchor the circadian signal that has weakened with age and hormonal change. The evidence is stronger for the timing and circadian regulation function than for the sedative function. This means melatonin works best when taken consistently at the same time each evening rather than only on nights when sleep feels elusive. In the UK, melatonin is prescription-only. In the US, Canada, and Australia it is available over the counter. If you are over 55 and experiencing insomnia, it is worth discussing with your doctor.

Light exposure: the melatonin on-switch

Melatonin production depends on the absence of light, particularly blue-spectrum light. Even small amounts of artificial light in the evening, from screens, overhead lighting, or ambient sources, suppress melatonin production. Getting bright natural light in the morning strongly sets the circadian clock and strengthens the evening melatonin rise. This is not a metaphor for healthy living. It is the direct mechanism of how melatonin is produced, and manipulating light exposure is one of the most powerful and underused tools available.

Herbs with evidence

Valerian combined with passionflower or hops has the most consistent evidence among herbal approaches for sleep onset and quality, acting via GABA pathways. Lemon balm reduces nighttime anxiety that prevents sleep onset. Chamomile binds to GABA receptors mildly and has evidence for reducing anxiety and improving sleep quality in older adults. Tart cherry juice provides melatonin precursors and has small-study support for improving sleep duration and efficiency. None of these replace HRT or progesterone where those are appropriate, but they are reasonable additions to a broader approach, particularly for women in regions where hormone therapy is less accessible.

Sleep hygiene: the basics that actually matter

A consistent sleep and wake time, even at weekends, is the most powerful behavioural tool for stabilising circadian rhythms. Keeping the bedroom cool reduces night sweat disruption. Avoiding alcohol in the evening is underappreciated. Alcohol initially promotes sleep onset but then fragments sleep architecture in the second half of the night, cutting into the deep stages where restoration happens.

When to see a doctor

If sleep disruption is significantly affecting your daily functioning, your mood, your cognitive performance, or your relationships, it warrants a clinical conversation rather than continued solo management. Describe the specific pattern: difficulty falling asleep, waking and not returning to sleep, or waking feeling unrestored despite adequate hours. These three patterns have different drivers and different responses, and naming which one you have gives your doctor something specific to work with. Sophora’s Doctor Prep document can help you bring a clear, organised account of your sleep to that appointment.

Questions you are probably asking

Can I just take melatonin to fix my perimenopause sleep?

Melatonin can help with the circadian signal, but it does not address the hormonal drivers that are also disrupting sleep. Think of it as one layer in a multi-layered problem. At low doses taken consistently, it is a reasonable addition. It is not a complete answer on its own.

Why do I wake at 3am even when I fall asleep fine?

Early morning waking is typically a combination of melatonin falling too soon, progesterone’s GABA support being reduced, and the early cortisol surge that perimenopause can produce between 2 and 4am. All three are hormonal. All three are manageable with the right approach.

Is it safe to take melatonin long-term?

The evidence for long-term safety of low-dose melatonin is generally reassuring, though long-term data is more limited than for shorter-term use. Higher doses are not more effective and may disrupt the natural melatonin rhythm further. If you are taking other medications, check for interactions. Discuss with a clinician if using for more than a few weeks consistently.

Will sleep improve after menopause?

For many women, yes. Once the hormonal volatility of perimenopause settles into the more stable postmenopausal state, some of the sleep disruption eases. Melatonin remains lower than in younger years, but the erratic hormonal swings that compound the disruption stop. Building good sleep habits during the transition provides a foundation for the better sleep that tends to follow.

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Sleep did not stop working. The hormonal signal that was telling the brain it was time to sleep has weakened. Those are different problems, and they have different solutions.

Last reviewed: July 2026  ·  Review due: September 2026  ·  Not therapy. Not medical advice. For your own use and understanding only.  ·  mysophora.com