ABSTRACT
A revision of the International Classification of Sleep Disorders (ICSD) has just been completed (1). In the previous classification published in 1990, and revised in 1997 (2), narcolepsy and idiopathic hypersomnia were distinguished. Other conditions listed included recurrent hypersomnia (such as the Kleine-Levin syndrome), posttraumatic hypersomnia (all part of a section called intrinsic sleep disorders), and insufficient sleep syndrome (part of a section called extrinsic sleep disorders).
