Sleep Neurology Glossary
100 terms total — 9 showing — Last updated 15 Sep 2026
multiple sleep latency test MSLT
Daytime sleep study measuring the tendency to fall asleep, used primarily to diagnose narcolepsy and assess excessive daytime sleepiness.
sleep latency onset REM
The time interval from sleep onset to the first appearance of REM sleep, typically measured in minutes.
sleep onset association disorder
A behavioral sleep disorder where an individual requires specific conditions or objects to fall asleep.
sleep onset insomnia
Difficulty falling asleep within a reasonable time period, typically taking more than 30 minutes to fall asleep.
sleep onset latency
The amount of time required to transition from full wakefulness to sleep onset.
sleep onset REM
Abnormal transition directly into REM sleep within 15 minutes of sleep initiation.
sleep onset REM episodes
Occurrence of REM sleep within 15 minutes of sleep onset, often indicating narcolepsy or severe sleep deprivation.
sleep onset REM period
Occurrence of REM sleep within 15 minutes of sleep onset, considered abnormal and suggestive of narcolepsy.
sleep phase advancement
Therapeutic shifting of sleep timing to an earlier schedule to treat delayed sleep-wake phase disorder.
sleep-related seizure
Epileptic seizures that occur predominantly or exclusively during sleep, requiring differentiation from parasomnias.