A sleep disorder, or somnipathy, is a medical disorder of the sleep patterns of a person. Some sleep disorders are serious enough to interfere with normal physical, mental, social and emotional functioning. Polysomnography and actigraphy are tests commonly ordered for some sleep disorders. Kleine-Levin Syndrome (KLS), also known as “Sleeping Beauty” syndrome, is a rare neurological disorder characterised by recurrent bouts of hypersomnolence (excessive sleeping) along with cognitive and behavioural problems during wakefulness.Sleep related groaning, also called catathrenia, causes you to groan vocally while you sleep. Sleep related groaning is a long-lasting disorder that often occurs nightly. The groaning sound is usually quite loud. ... Then you make a long exhale that includes the moaning sound.