就眠 (jiù mián) is a formal, literary verb meaning 'to go to bed' or 'to retire for sleep.' It combines 就 (jiù), which here conveys the sense of 'to approach' or 'to take up (a state or position),' and 眠 (mián), meaning 'to sleep.' Together, they express the deliberate, often ritualized act of settling into sleep — not merely lying down, but entering the sleep state. This term is rarely used in casual daily speech; instead, it appears in medical contexts (e.g., sleep studies), official health guidelines, literature, news reports, or polite written notices.

The word carries a tone of dignity, calm, or clinical precision — you might see it on a hospital chart noting 'patient fell asleep at 10:15 p.m.' or in a wellness article advising 'regular bedtime helps regulate circadian rhythm and supports timely 就眠.' Unlike colloquial alternatives like 睡觉 (shuì jiào), 就眠 emphasizes intentionality and transition into rest, often implying an ideal or healthy sleep onset.