What Causes Excessive Sweating When Sleeping?

Most people experience excessive sweating when sleeping. This is usually caused by an overactive sympathetic nervous system (SNS) that triggers sweating as part of the fight or flight response. When you are awake, your SNS remains active during sleep; however, when you go to bed and fall asleep, it stops working and sends signals to activate sweat glands in the skin above your forehead which results in excessive perspiration. If this happens often enough, it can lead to a nightmare for many! Too much perspiration can also interfere with normal sleep cycles causing night sweats, making you feel tired throughout the day and possibly even preventing you from getting out of bed at times due to feeling too hot or sweaty.[1]

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