<unk>  is a debilitating lifelong rapid eye movement (REM) sleep disorder that has a typical onset during adolescence or early adulthood and is characterized by a classic tetrad of Excessive Daytime Sleepiness (EDS), cataplexy (sudden symmetric loss of muscle tone during wakefulness that is evoked by strong emotions), sleep paralysis and hypnagogic hallucinations (hallucinations while falling asleep). Other features include frequent irresistible sleep attacks, fragmented night sleep, loss of concentration and memory, hypnopompic hallucinations (hallucinations during waking up) and blurry vision.<unk>  is of two types:<unk>  type 1 (formerly<unk>  with cataplexy) and<unk>  type 2 (formerly<unk>  without cataplexy).<unk>  can have severe consequences for the patient with impairments in academic, social and occupational performances. Problems may include social stigma associated with the disease, reduced quality of life, difficulty in obtaining an education and keeping a job and socioeconomic consequences. It can restrict patients from having certain careers and activities.<unk>  is often under-diagnosed and 5-10 years of delay is common before making a firm diagnosis.
Narcolepsy
Alcohol withdrawal
Caffeine-induced sleep disorder
Opiate withdrawal
Opioid withdrawal
Advanced sleep phase syndrome
Amphetamine psychosis
Cocaine withdrawal