Night sweats, also known as nocturnal hyperhidrosis is a kind of perspiration disorder, occurring during sleep. Excessive sweating when asleep is known as night sweating and the intensity of it can range from mild sweating to sweating to sweating profusely. Anxiety causing night sweats is a problem that may affect people of any age or gender and may be due to a variety of reasons. It may be more common in women as compared to men. It is considered to be one of the main symptoms of anxiety or a psychological disorder.