In the daytime, a hot flush is unpleasant but manageable. You take off a layer, open a window, fan yourself with whatever's to hand, and get on with your day. At night it's a different story. You wake up burning, sweating and wide awake, and it can take an hour to drift off again.
If your hot flushes (or hot flashes, as they're called in the US) seem worse at night, you're not imagining it. There are several good reasons why night-time can be the hardest time. Understanding them makes it easier to know what to change.
What happens during a hot flush?
To understand why nights are harder, it helps to know what's going on in a flush.
Your brain has a built-in thermostat, in an area called the hypothalamus. Normally, your body tolerates a fairly wide range of core temperatures. You only start sweating when you get quite hot, and only start shivering when you get quite cold. The gap in between is known as the "thermoneutral zone".
During menopause, that zone becomes much narrower. A very small rise in core temperature is enough to set off the full cooling response: blood vessels in your skin open up, you go red and you sweat heavily (Freedman, 2014). Falling oestrogen is part of the reason, though not all of it.
Put simply, you have far less wiggle room than you used to. And at night, plenty of things can nudge you over the edge.
Why are hot flushes worse at night?
1. Your bed is designed to keep heat in
A duvet, a warm bedroom, a partner giving off heat, a mattress that holds warmth: all of these trap heat around your body. With a narrow comfort zone, that slow build-up is often enough to trigger a flush. During the day you'd notice you're getting warm and take a layer off. When you're asleep, you can't.
2. Your body follows a daily temperature rhythm
Your core temperature isn't fixed. It rises and falls through the day in a regular pattern. In a small study that monitored women around the clock, hot flushes followed a daily rhythm, peaking in the early evening, at about 6.25pm. Most flushes were preceded by a small rise in core body temperature (Freedman and others, 1995). It was only a small study, but it fits what many women notice: evenings and the early part of the night can be a hotspot.
As you go to sleep, your body naturally tries to cool down. Women's Health Concern, the patient arm of the British Menopause Society, notes that this is why a cool sleeping environment helps sleep, and why it matters even more when you're having night sweats.
3. Evening habits add up
Many common hot-flush triggers tend to cluster in the evening. Women's Health Concern lists coffee, hot drinks, some spicy foods, alcohol and stress. A glass of wine with dinner, a cup of tea in front of the TV or a late, rich meal can all play a part.
4. Stress narrows the zone even further
The same research on the thermostat found that stress activation in the body is one of the things that narrows the comfort zone. Bedtime is often when the day's worries finally get your attention. Lying there tense and wound up can make a flush more likely, and harder to settle after.
5. You notice them more
A daytime flush is an interruption. A night-time one can wake you from deep sleep with a racing heart and damp sheets, and then leave you lying awake. Hot flushes account for some, but not all, of the sleep problems women have around menopause. Worry, a busy mind and the frustration of being awake all play their part too.
What can help with hot flushes at night?
Here's how each cause matches up with something practical to try:
| Why it's worse at night | What to try |
|---|---|
| Your bed traps heat | Lighter layers instead of one heavy duvet. Cotton sheets and nightclothes. A towel under you to soak up sweat. A cooling pillow. |
| Your body's temperature rhythm | Keep the bedroom cool, with a fan or an open window. Have a cool shower before bed rather than a hot one. |
| Evening triggers | Try cutting back alcohol, hot drinks, caffeine and spicy food in the evening for a couple of weeks and see what changes. |
| Stress at bedtime | A wind-down routine. Slow breathing from your stomach. Write down tomorrow's worries before bed. |
| Lying awake afterwards | Get up calmly, cool down, then get back into bed and breathe slowly. Try not to check the clock. |
Keeping a short diary of your flushes, and what happened just before them, can help you spot your own triggers.
It's worth being honest about the evidence. When experts reviewed the research, they found limited evidence that cooling tips and avoiding triggers reduce how many flushes you have (The Menopause Society, 2023). Still, they're low-risk, cost little, and many women find they make each flush easier to live with.
Calmer thoughts at night
Women's Health Concern points out that worrying about lost sleep makes it harder to get back to sleep. When a flush wakes you, try a calmer response: "This will pass in a few minutes." "I've coped with this before." "I'll deal with tomorrow when it comes." It sounds small, but it can stop one flush turning into two hours awake.
Treatments to talk to your GP about
If hot flushes are disturbing your sleep night after night, you don't have to just put up with it.
- HRT. NICE's menopause guideline (NG23) says doctors should offer HRT for hot flushes and night sweats. The Menopause Society describes hormone therapy as the most effective treatment.
- Menopause-specific CBT. NICE added this in 2024 as an option for hot flushes, and for sleep problems such as night-time waking that are linked to them.
- Non-hormonal medicines. These include fezolinetant, which NICE recommends as an option for moderate to severe hot flushes when HRT isn't suitable. Your GP can talk through others.
Mind-body approaches have been studied too. In its 2023 review, The Menopause Society recommended CBT and clinical hypnosis as non-hormone options for hot flushes, both rated at its highest level of evidence. The hypnosis studies used structured programmes designed and tested by clinical researchers.
When to see your GP
Hot flushes and night sweats are very common in menopause, but sweating at night can have other causes. The NHS suggests seeing a GP if:
- night sweats regularly wake you up or worry you
- you also have a very high temperature, feel hot and shivery, or have a cough or diarrhoea
- you're losing weight without trying
Some medicines can cause sweating at night too. If you're worried that a medicine might be playing a part, talk to your GP or pharmacist rather than stopping it yourself.
Where relaxation and hypnosis recordings fit in
Some women like to use a relaxation or hypnosis recording as part of their wind-down, alongside the practical changes above. It's a chance to slow your breathing, let the day go and feel calmer before bed.
Our recording Cool and Calm combines deep relaxation with vivid cooling imagery, and a simple cue you can practise: a slow breath out and the word "cool". It's a relaxation recording, not a medical treatment, and it doesn't replace advice from your GP.
You can also try our free Ten-Minute Calm Reset to see whether this kind of recording suits you.
This article is general information, not medical advice. If you're worried about any symptom, please talk to your GP or pharmacist.
