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This is called nocturnal hyperhidrosis.

If you’re sweating while you sleep, it’s not your fault. You may have heard that you’re sweating because of a psychological issue, but that’s not the case. There are a few reasons why people sweat in their sleep, and it can be treated. Find out more about why do I sweat in my sleep and how to stop it.

What is nocturnal hyperhidrosis?

Nocturnal hyperhidrosis is when you sweat excessively at night. It can cause your sheets to be damp with sweat and make your pillow wet. This can lead to feeling uncomfortable during the night, as well as waking up feeling sticky and uncomfortable.

What causes nocturnal hyperhidrosis?

The Mayo Clinic

  • Excessive stress
  • Some medications
  • Hyperthyroidism (overactive thyroid)

“The Mayo Clinic” says that the most common cause of excessive sweating is an overactive sympathetic nervous system (SNS). The SNS regulates the body’s fight or flight response by increasing heart rate, constricting blood vessels, raising blood pressure and releasing adrenaline into the bloodstream.