disorders of excessive somnolence
A sleep disorder in which a person slips abruptly from an active, often emotional, waking state into several minutes of rapid eye movement (REM) sleep. Narcolepsy is associated with cataplexy, in which a sudden loss of muscle control results in an individual suddenly collapsing. [Source: The SAGE Glossary of the Social and Behavioral Sciences; Narcolepsy]
narcolepsy
cataplexy
concepts