Black and white photograph of woman sleeping in bed, partially uncovered. Possibly sweating, sleeping too warm.

· Article

Why Do I … Sweat When I Sleep?

· Article

Why Do I ... Sweat When I Sleep?


You go to bed shivering, only to wake up in a sweat. What’s all that about? Assuming you’re not down with a fever, sweating when you sleep is simply a matter of your body trying to regulate its own thermostat. We spoke with Sleep Number experts to explain what’s going on.

Question: Is sweating when I sleep normal?

Answer: Yes, it is. Thermal regulation and sleep go hand-in-hand.

Q: What causes sweating?

A: When you lie down, your body temperature drops. The faster it drops, the faster and deeper you sleep. Sweating occurs because your body is cooling off by releasing heat, and that heat is then trapped in the bed. Sweating when you sleep is a good thing, because it means your body is working the way it’s supposed to.

Q: What can I do to avoid sweating?

A: If you don’t enjoy waking up in a sweat, turn your thermostat down or open a window. Use a fan to blow the heat away from yourself. Limit caffeine and food close to bedtime, as they speed up your metabolism which creates additional heat. Avoid strenuous activity before bed, which also raises the body temperature. A warm shower or foot bath before bed will also speed up the temperature drop. By letting the water evaporate off your skin, your body temperature will start to drop before you even get into bed.

Q. Does it matter what I wear or what kind of mattress I use?

A. Yes. Fabrics such as synthetics and certain bedding materials such as various types of foam cause your body temperature to rise.

For a more comfortable night, Sleep Number has designed a line of bedding called In Balance, which pulls heat away from your body when too warm and releases heat as your body cools.

Like diet and exercise, quality sleep is essential for optimal health and performance. Because everyone’s sleep needs are different, Sleep Number 360® smart beds, with SleepIQ® technology inside, sense your movements and automatically adjust firmness, comfort and support to keep you both sleeping comfortably. Find your Sleep Number® setting for your best possible night’s sleep.

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