Why we sleep poorly before menstruation, or cyclic insomnia
Every month it repeats itself. A few days before menstruation arrives, fatigue sets in, along with irritability, headaches – and yet at night, eyes wide open. The clock ticks, thoughts spin in circles, and sleep simply won't come. Many women know this phenomenon intimately, yet few name it correctly. It's called cyclic insomnia, and it's a completely real physiological phenomenon rooted deep in the hormonal changes of the female body.
It's not a fabrication or oversensitivity. Research repeatedly shows that sleep quality changes throughout the menstrual cycle, and does so in a completely predictable way. Yet a large proportion of women are unaware of this connection, or attribute it to stress, bad habits, or coincidence. Understanding why we sleep poorly before menstruation is the first step toward being able to do something about it.
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What happens in the body just before menstruation
The menstrual cycle isn't just about the bleeding itself. It's a complex hormonal dance whose individual phases influence mood, energy, appetite – and of course sleep. In the second half of the cycle, known as the luteal phase, which begins after ovulation and lasts approximately two weeks, progesterone rises significantly. This hormone has sedative effects, paradoxically causing daytime fatigue while simultaneously disrupting the architecture of nighttime sleep.
Just before menstruation, levels of both estrogen and progesterone drop sharply. And it is precisely this sudden hormonal decline that is the key trigger for insomnia. Estrogen supports the production of serotonin and regulates melatonin levels – two substances that are absolutely essential for quality sleep. When estrogen drops, the body's natural ability to fall asleep and remain in deep sleep drops with it. Melatonin levels are demonstrably lower in the premenstrual phase, as confirmed by numerous studies published in specialist journals such as the Journal of Clinical Endocrinology & Metabolism.
There is yet another mechanism at play that receives less attention: body temperature. During the luteal phase, basal body temperature is slightly higher than in the first half of the cycle. And because a drop in body temperature is one of the conditions for quality sleep onset, the body during this period simply doesn't "know" it's time to sleep. The result is difficulty falling asleep, frequent waking in the middle of the night, or very light, unrefreshing sleep.
It's no wonder, then, that many women describe the days before menstruation as a period when they're exhausted during the day but can't sleep at night. This apparent paradox has a completely logical physiological explanation.
Cyclic insomnia as part of PMS
Most people know the acronym PMS – premenstrual syndrome – and associate it primarily with mood swings, bloating, or breast tenderness. Yet insomnia is one of its very common but overlooked symptoms. It is estimated that sleep difficulties before menstruation affect up to one third of women of reproductive age, with some suffering from cyclic insomnia severely enough that it significantly reduces the quality of their daily functioning.
Cyclic insomnia differs from ordinary insomnia precisely in its predictability. It recurs every month, always in the same phase of the cycle, and typically resolves on its own once menstruation begins. This is an important diagnostic clue – if a woman notices that her sleep problems follow a regular pattern and correlate with her cycle, it is very likely that this is exactly this type of insomnia.
Interestingly, cyclic insomnia can also have a psychological component. The premenstrual phase is often associated with heightened anxiety, increased sensitivity to stress, and a tendency toward rumination. These states disrupt sleep in their own right, so hormonal and psychological factors reinforce one another. As psychiatrist and sleep specialist Helene Emsellem aptly put it: "Sleep and mood are inextricably linked – and hormonal fluctuations deepen this relationship even further."
Why it's important to take cyclic insomnia seriously
Chronic sleep deprivation – even that which comes "only" once a month – has real health consequences. Lack of sleep affects the immune system, metabolism, ability to concentrate, and emotional regulation. In women who suffer from cyclic insomnia repeatedly over a long period, there may be a gradual deterioration in overall sleep quality even outside the premenstrual phase.
There is also an interesting feedback loop: poor sleep itself raises cortisol levels – the stress hormone – which further disrupts hormonal balance. This creates a vicious cycle that is difficult to break without a conscious approach. Understanding the causes is therefore just as important as finding solutions.
Take as an example Markéta, a thirty-year-old teacher who for years attributed her fatigue and morning exhaustion to a "bad rhythm." It was only when she began tracking her sleep in an app while simultaneously recording her cycle phases that she realised she was going through a roughly five-day period of significantly worse sleep quality every month – always at the same time before menstruation. This awareness allowed her to adjust her schedule, reduce her demands on herself during these days, and begin actively working on supporting her sleep during the critical period.
What helps: natural approaches to better sleep in the luteal phase
The good news is that there are many ways to reduce cyclic insomnia – and many of them require neither medication nor medical intervention. The key is to adapt one's lifestyle to the specific phase of the cycle, rather than living every day the same way regardless of what is happening in the body.
One of the most important steps is supporting melatonin production through natural means. This means limiting exposure to blue light from screens at least an hour before bedtime, keeping the bedroom cool and dark, and going to bed at the same time every day. In the premenstrual phase, this sleep hygiene is even more important than at other times, because the body needs stronger external cues to switch into sleep mode.
Nutrition also plays a significant role. Magnesium is a mineral that naturally contributes to regulating the nervous system and supports muscle relaxation. Numerous studies suggest that many women have an increased need for magnesium during the luteal phase, and a deficiency can contribute to both insomnia and other PMS symptoms. Foods rich in magnesium – such as pumpkin seeds, dark chocolate, almonds, or leafy greens – are therefore particularly valuable during this period. Similarly helpful is tryptophan, an amino acid found in bananas, oats, and turkey, among others, which is a precursor to serotonin and melatonin.
Physical activity is another powerful tool – but the intensity and timing matter. Light to moderate exercise, such as yoga, pilates, or a walk in nature, helps reduce cortisol and improves sleep quality. Conversely, intense training close to bedtime can worsen the situation by raising body temperature and adrenaline levels.
An increasing number of women are also turning to adaptogens and herbal preparations that support hormonal balance and calm the nervous system. Ashwagandha, valerian root, and St. John's wort are among the herbs with a long tradition of use for sleep disorders and anxiety. However, it is advisable to consult a doctor or pharmacist before using them, especially if a woman is taking other medications.
Mental wellbeing is equally important. Techniques such as meditation, breathing exercises, or simple journaling before bed can help calm the ruminating mind that is particularly active during the premenstrual phase. Apps like Insight Timer or Calm offer guided meditations specifically focused on sleep and relaxation.
For women seeking a comprehensive approach to self-care in harmony with the menstrual cycle, the concept of cycle syncing may provide inspiration – that is, adapting diet, movement, work, and rest to the individual phases of the cycle. This approach was popularised by nutritional consultant Alisa Vitti in her book WomanCode, which has become a guide for thousands of women seeking harmony with their own bodies.
Practical steps for supporting sleep during the premenstrual phase can be summarised across several areas:
- Sleep hygiene: regular bedtime, a cool and dark bedroom, limiting screens before sleep
- Nutrition: foods rich in magnesium and tryptophan, reducing caffeine and alcohol
- Movement: light to moderate activity, ideally in the morning or early afternoon
- Mental care: meditation, breathing exercises, journaling
- Herbal support: adaptogens and calming herbs, following consultation with a specialist
If insomnia persists or is very intense, it is always appropriate to visit a gynaecologist or general practitioner. In some cases, cyclic insomnia may be a symptom of a more serious hormonal imbalance, such as polycystic ovary syndrome or premenstrual dysphoric disorder, which requires specialist treatment.
The female body is not a machine that functions the same way every day. It is a living system governed by rhythms that have their own logic. And it is in understanding these rhythms – rather than fighting against them – that the path to better sleep, more energy, and an overall sense of wellbeing lies. Cyclic insomnia before menstruation need not be an inevitable fate – it can be a signal the body is sending, and an invitation to listen to it a little more carefully.
