noun
sleep onset REM period; SOREMP
Technical term in sleep medicine; refers to REM sleep occurring within 15–20 minutes of falling asleep, often associated with narcolepsy.
ナルコレプシーの診断では、入眠時レム期の有無が重要な指標となる。
In diagnosing narcolepsy, the presence of a sleep onset REM period is an important indicator.
Compound of 入眠 (にゅうみん, 'falling asleep'), 時 (じ, 'time'), レム (REM), and 期 (き, 'period'). The exact derivation is straightforward from its components.