Why Do I Get So Hot When I Sleep? Causes and Simple Ways to Stay Cool
By WellnessVigor · Updated October 9, 2026 · 8 min read
You fall asleep comfortable, then wake up at 3 a.m. kicking off the covers, damp and wide awake. Feeling hot at night is one of the most common sleep complaints, and it is more than just uncomfortable: heat makes it harder to fall asleep and cuts into the deep and REM sleep your body needs.
Here is why it happens and the simple changes that help most people sleep cooler.
Quick answer
Your body needs to cool down to sleep well. A warm room, heavy bedding, a memory foam mattress, late meals, alcohol and exercise close to bedtime can all trap heat. Aim for a bedroom around 65°F (about 18°C), choose breathable bedding, use a fan and take a warm shower 1 to 2 hours before bed. If night sweats are drenching or come with fever or weight loss, see a doctor.
Your core body temperature naturally starts dropping about two hours before you fall asleep and stays lower through the night. This drop is one of the signals that tells your brain it is time to sleep. When the room or your bedding stops heat from escaping, your body struggles to cool down and you wake more often.
According to the Sleep Foundation, the ideal bedroom temperature for most adults is about 65 to 68°F (15.6 to 20°C).
Common causes of feeling hot in bed
- A warm bedroom: the most common cause, especially in summer or upstairs rooms.
- Bedding that traps heat: thick polyester duvets, flannel sheets and dense memory foam hold warmth close to the body.
- Late heavy meals: digestion raises body heat.
- Alcohol: widens blood vessels near the skin and can cause sweating later in the night.
- Evening exercise: hard workouts close to bedtime keep core temperature up.
- A warm partner or pet: sharing the bed adds heat.
- Hormonal changes: menopause and perimenopause often cause hot flashes and night sweats.
- Medications and health conditions: some antidepressants, fever-reducing medicines, thyroid problems and infections can cause night sweats.
10 simple ways to sleep cooler
- Set the thermostat to around 65°F (18°C) if you can.
- Close blinds during the day so the bedroom does not heat up in the sun.
- Run a fan to move air across your body. Point it at the bed or place it in a window at night.
- Choose breathable sheets such as cotton percale, linen or bamboo-derived fabrics.
- Swap the heavy duvet for a light blanket you can layer.
- Add a cooling mattress topper if your memory foam mattress sleeps hot.
- Take a warm shower or bath 1 to 2 hours before bed. It sounds backwards, but it helps your body shed heat afterwards.
- Wear light, loose cotton pajamas or sleep with less clothing.
- Eat dinner earlier and keep alcohol light in the evening.
- Control humidity. Damp air makes sweat evaporate slowly; a dehumidifier or AC helps.
When to see a doctor
Feeling warm at night is usually about your room and habits. Talk to a doctor if you have:
- Night sweats that soak your sheets and pajamas
- Night sweats with fever, unexplained weight loss or swollen glands
- Sudden night sweats after starting a new medication
- Hot flashes that seriously disrupt your sleep
Cooling the room is one piece of good sleep. The 14-Day Sleep Reset helps you build the full routine, night by night.
Keep reading
Frequently asked questions
What is the best room temperature for sleep?
Why do I wake up hot at 3 a.m.?
Does a hot shower before bed help you sleep?
Are night sweats serious?
Sources
This article is for general information only and is not medical advice. See our Medical Disclaimer.