Why Do I Wake Up Sweating at Night?
If you're a woman waking up sweating at night — sometimes so much that your pyjamas or sheets are damp — this is most likely a perimenopause or menopause symptom. Night sweats are the nighttime version of hot flushes, and they're caused by the same mechanism: your oestrogen levels are dropping, and your body's temperature regulation system is struggling to adjust.
Night sweats are not dangerous, but they are disruptive. They fragment your sleep, leave you exhausted the next day, and can make you feel like something is wrong with you. There is nothing wrong with you. Your body is going through a transition, and there are things you can do.
Why oestrogen causes night sweats
Oestrogen helps regulate your body's internal thermostat — a region of the brain called the hypothalamus. When oestrogen levels drop, the hypothalamus becomes more sensitive to small temperature changes. It overreacts, sending signals to dilate blood vessels and trigger sweating even when your body isn't actually too warm.
This is why night sweats often happen without any external trigger. Your room is cool, your bedding is fine, but your body's thermostat misfires and you wake up drenched.
When night sweats are not menopause
Night sweats can also be caused by thyroid disorders, anxiety, certain medications, low blood sugar, or — rarely — more serious conditions. If your night sweats are accompanied by unexplained weight loss, fever, or a persistent cough, see your doctor.
But for the vast majority of women in their 40s and 50s, night sweats are perimenopause. If you also have irregular periods, brain fog, mood changes, or daytime hot flushes, the picture is clear.
What actually helps
Lower your bedroom temperature to 16-18 degrees. This is the single most effective change you can make. Your body needs a cool environment to prevent the thermostat from misfiring.
Switch to breathable bedding — cotton or bamboo, not synthetic. Moisture-wicking sleepwear made specifically for night sweats can make a significant difference.
Cut alcohol and spicy food in the evening. Both are common triggers that raise your core temperature and make night sweats more likely.
Magnesium glycinate before bed helps stabilise your nervous system. Some women also find relief with sage extract or black cohosh, though the evidence is mixed.
Want to know what's really going on in your body?
Take the free Hormone Scan. It maps your exact symptoms to your hormonal profile and tells you precisely where to start.
Frequently Asked Questions
Are night sweats always a sign of menopause?
For women in their 40s and 50s, night sweats are most commonly a sign of perimenopause. However, they can also be caused by thyroid issues, anxiety, medications, or low blood sugar. If you have other symptoms, menopause is the most likely explanation.
When should I worry about night sweats?
Night sweats combined with unexplained weight loss, persistent fever, or a lasting cough should be checked by a doctor. Night sweats on their own — especially with other perimenopause symptoms — are normal and manageable.
What is the best temperature to prevent night sweats?
16-18 degrees Celsius is ideal. Your body needs a cool environment to maintain stable temperature regulation during sleep. Anything warmer increases the likelihood of your hypothalamus misfiring and triggering a sweat response.