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sleep onset REM
Abnormal transition directly into REM sleep within 15 minutes of sleep initiation.
Full Definition
Sleep onset REM (SOREM) refers to the pathological occurrence of REM sleep within 15 minutes of sleep onset, bypassing the normal progression through NREM stages. This phenomenon is characteristic of narcolepsy and other central disorders of hypersomnolence. SOREM episodes are quantified during multiple sleep latency tests and are significant diagnostic markers when two or more occur during daytime nap opportunities.
Usage
Usage note: Often abbreviated as SOREM in clinical documentation.
In Context
- "The MSLT revealed three sleep onset REM periods, supporting a diagnosis of narcolepsy." — diagnostic report
- "Sleep onset REM episodes may indicate disrupted circadian rhythm regulation." — research publication
Also known as
SOREM
REM sleep onset
Contrasted with
normal sleep architecture
Don't confuse with
REM rebound
sleep onset REM period