Glossary of Sleep-related terms

Dissociated state

A situation in which only part of the normal complement of features characterizing a particular biological state is seen in isolation or in association with phenomena typical of another state. For example, in cataplexy the hypotonia of REM sleep is associated with wakefulness and the absence of other motor phenomena typical of this state (twitching, rapid eye movements, automatic fluctuations); cateplexy is referred to as a dissociated (REM) state.4