The body needs to lower its temperature slightly to enter deep, restorative sleep.
When the room is too warm, the body struggles to cool down. This keeps the nervous system active and can increase heart rate.
Studies have shown that sleeping in overly warm environments can lead to:
elevated nighttime blood pressure
lighter, less restorative sleep
increased cardiovascular stress
The ideal sleep temperature is usually between 15°C and 19°C (59°F–66°F).
If you feel cold, it’s better to use light blankets or comfortable clothing rather than raising the heat too much.
2. Sleeping in a position that makes breathing difficult
Sleep posture also plays a bigger role than many people realize.
Sleeping on your back—especially without slightly elevating your head—can contribute to sleep apnea, a condition where breathing temporarily stops multiple times
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