If you have started waking in the night feeling suddenly, inexplicably hot, you are not imagining it and you are not alone.
Around 75 percent of women going through perimenopause and menopause experience night sweats, and for many, disrupted sleep is one of the first symptoms to appear, often before any other sign of the transition.
This is not a case of your bedroom being too warm or your duvet being too heavy, although both can make things worse. It is a physiological shift in how your body manages heat, and understanding it is the first step to sleeping through it.
Your body has a thermostat, and oestrogen helps run it
Body temperature is regulated by the hypothalamus, a small region at the base of the brain that keeps your core temperature within a narrow, stable range. Oestrogen plays a direct role in how that thermostat is calibrated.
As oestrogen levels fluctuate and decline during perimenopause and menopause, the hypothalamus becomes more sensitive to small changes in core temperature. A rise that would normally go unnoticed can be misread as overheating, triggering the body's cooling response: blood vessels near the skin dilate, sweat glands activate, and heart rate increases. That is a hot flush. When it happens during sleep, it is a night sweat.
Your sheets don't cause night sweats. But the wrong ones make every episode feel worse, and the right ones make each one easier to sleep through.
Why it happens more at night
Core body temperature naturally drops in the evening as part of the process that prepares you for sleep. During perimenopause and menopause, this natural dip can be enough to trigger the hypersensitive thermostat response described above, which is part of why night sweats are often worse than daytime hot flushes, even for the same person.
Sleep itself is also more fragile during this life stage. Hot flushes tend to cluster in the first half of the night, coinciding with the deep sleep stages that are hardest to recover once interrupted. The result is not just a hot, uncomfortable few minutes, it is a night of sleep that never properly completes its cycle.
What actually helps
There is no single fix, because the underlying cause is hormonal rather than environmental. But several changes reduce how disruptive each episode is.
- Keep the bedroom between 16 and 18°C, so your body has less distance to fall before a flush pushes it back up
- Layer lightly rather than using one heavy duvet, so you can push covers off mid-sleep without fully waking
- Choose a fabric that wicks moisture away from the skin rather than absorbing and holding it, such as eucalyptus lyocell
- Time alcohol and caffeine earlier in the day, since both raise core temperature and can intensify flushes overnight
None of these will stop hot flushes happening. What they can do is shorten how long you are lying awake afterwards, and reduce how wet and uncomfortable each episode feels, which over months adds up to meaningfully better sleep.
You are not alone in this, and it is measurable
We built the Sleep Disruption Index using NHS prescribing data and Met Office temperature records to map how sleep disruption linked to menopause varies across England, town by town. It exists because this experience is common, regional, and rarely talked about with any real data behind it.
Search your own postcode on the Sleep Disruption Index and see how your area compares, using its menopause-specific lens.
Mossva's sheets are made from 100% eucalyptus lyocell, chosen specifically for how it performs through exactly this kind of overnight temperature swing. Many of our customers came to us after a run of nights like the one described above.
Frequently asked questions
Can bedding actually help with menopause night sweats, or is it just marketing?
Fabric cannot change your hormones, but it does change how much moisture sits against your skin and how quickly heat disperses once a flush starts. That has a real, if modest, effect on how disruptive each episode feels and how quickly you settle back to sleep.
How long does perimenopause typically affect sleep for?
This varies significantly between individuals. Perimenopause itself can last anywhere from a few months to several years, and sleep disruption does not always track neatly with other symptoms. Some women find sleep improves before hot flushes fully resolve, others find the reverse.
Should I see a doctor about night sweats?
If night sweats are new, severe, or accompanied by other symptoms such as unexplained weight loss or fever, it is worth speaking to a GP to rule out other causes. For night sweats clearly linked to the menopause transition, a GP can also discuss options including HRT, which many women find effective for sleep specifically.
Is eucalyptus lyocell better than bamboo for night sweats?
Both are natural fibres marketed for cooling, but they are not the same. Most bamboo sheets are bamboo viscose, which is chemically processed and does not retain the same natural moisture-wicking structure as eucalyptus lyocell.