Sleep hyperhidrosis

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Symptom/Sign: **Sleep hyperhidrosis**
*Classifications and external resources*
ICD-10	R 61.9
ICD-9	780.8, 327

Sleep hyperhidrosis, more commonly known as the night sweats, is the occurrence of excessive sweating (hyperhidrosis) during sleep. The sufferer may or may not also suffer from excessive perspiration whilst awake.

Sleep hyperhidrosis may occur at any age, but is most commonly seen in early adulthood.

Night sweats may occur for genetic reasons and may be relatively harmless. However, they can be distressing and disrupt sleep patterns if severe; the patient may be frequently awakened due to the discomfort of damp sleepwear.

One of the most common causes of night sweats in women over 40 is the hormonal changes related to menopause and perimenopause. This is a very common occurrence during the menopause transition years and while annoying, it is not necessarily dangerous or a sign of underlying disease. Some women experience night sweats during pregnancy due to hormonal changes.

It should be noted that while some causes of night sweats may be relatively harmless, others may not and can be a sign of a serious underlying disease. While there can be several possible causes of excessive sweating at night, it is important to distinguish night sweats due to medical causes from those that occur simply because the sleep environment is too warm, either because the bedroom is unusually hot or because there are too many covers on the bed.

A night sweat caused by a medical condition or infection can be described as ‘severe hot flashes occurring at night that can drench sleepwear and sheets, which are not related to an overheated environment’.[1]

True night sweats with medical causes should be properly investigated by a medical physician.

[edit] Associated conditions

The condition may be considered a sign of various disease states, including:

Certain medications, including anti-depressants (such as sertraline) have also been known to cause night sweats in some individuals. Another cause could be withdrawal from various drugs (mdma, opiates, benzodiazepines, etc.).