睡眠 is the formal/medical term for sleep.
COMMON COLLOCATIONS:
- 睡眠を取る (to get sleep)
- 睡眠不足 (lack of sleep, sleep deprivation)
- 睡眠時間 (sleep time, hours of sleep)
- 睡眠障害 (sleep disorder)
- 睡眠の質 (sleep quality)
- 睡眠薬 (sleeping pill)
SIMILAR WORDS:
- 睡眠: sleep (formal, medical term)
- 眠り: sleep (poetic, literary)
- 眠る: to sleep (verb, everyday usage)
- 寝る: to sleep, to go to bed (more casual)