Why Do I Wake Up Sweating at Night?

Your body naturally lowers its core temperature as you fall asleep, and it does this partly by releasing heat through the skin. If that heat has nowhere to go, because the room is warm or your bedding traps it, you can end up sweating as your body works harder to cool down.

Bedding is a frequent cause. Thick comforters, non-breathable mattress toppers, and synthetic sheets can hold heat and moisture against your skin. Layers made from breathable, moisture-wicking materials let sweat evaporate and let warm air escape, which reduces that clammy feeling.

Room conditions matter just as much. A bedroom that is too warm or too humid makes it hard for your body to shed heat. Many people sleep better in a cooler room, so lowering the thermostat at night, improving airflow, and reducing humidity can all help.

Everyday habits play a role too. Alcohol, spicy food, and caffeine close to bedtime can raise body temperature or disrupt sleep, and exercising late in the evening leaves your body warmer for a while. Heavy or tight sleepwear can also trap heat, so lighter, looser fabrics tend to feel cooler.

Stress and an irregular schedule can contribute as well, since they affect how deeply and steadily you sleep. Building a calm, consistent wind-down routine and keeping the bedroom dark and cool supports the natural temperature drop that healthy sleep depends on.

If you have made these changes and still wake up drenched regularly, or if the sweating is sudden, severe, or paired with other symptoms, it is worth talking to a healthcare professional. Persistent night sweats can have medical causes that are worth checking. For the common case of simply running hot, though, cooler bedding and a cooler room solve the problem for most people.