noun
non-REM sleep
Technical term for the sleep stage without rapid eye movement; used in medical and scientific contexts.
ノンレム睡眠は深い眠りの段階です。
Non-REM sleep is a stage of deep sleep.
Variant with interpunct; less common but still seen.
REM sleep, the stage with rapid eye movement and dreaming; contrasts with non-REM sleep.
From English 'non-REM' + 睡眠 (sleep).