sleep onset REM period
Pronunciation: SORE-emp
Also written as: SOREMP
An abnormal sleep pattern where REM sleep occurs within 15 minutes of sleep onset, often indicative of narcolepsy or other sleep disorders.
Full Definition
Sleep Onset REM Period (SOREMP) is a polysomnographic finding characterized by the occurrence of REM sleep within 15 minutes of sleep onset, representing a significant deviation from normal sleep architecture. In healthy individuals, REM sleep typically does not occur until 60-90 minutes after sleep onset, following progression through non-REM sleep stages. SOREMPs are a key diagnostic criterion for narcolepsy and may also occur in other conditions such as sleep deprivation, shift work disorder, or severe depression. The presence of two or more SOREMPs during a Multiple Sleep Latency Test (MSLT), combined with excessive daytime sleepiness, strongly suggests narcolepsy. Documentation of SOREMPs requires careful analysis of polysomnographic recordings and precise timing measurements from sleep onset to REM sleep appearance.
Usage
Usage note: SOREMP acceptable as abbreviation; always specify timing criteria
In Context
- "The MSLT revealed three sleep onset REM periods, supporting a diagnosis of narcolepsy type 1." — Sleep medicine report
- "A sleep onset REM period was observed during the initial nocturnal polysomnogram." — Sleep study findings