上床 (shàng chuáng) literally means 'to go up onto the bed' and is the standard, neutral verb for 'to go to bed' — that is, to get into bed in preparation for sleeping. The character 上 (shàng) means 'up' or 'onto', and 床 (chuáng) means 'bed'; together they form a compound verb indicating the physical action of climbing into bed. It does not imply intimacy unless context clearly suggests it; in everyday usage, it simply marks the start of the sleep routine.

This phrase is commonly used in daily conversations about bedtime habits, health advice, or scheduling. It often appears with time expressions (e.g., 九点上床 — 'go to bed at nine') or with aspect particles like 了 (le) to indicate completion (e.g., 他上床了 — 'He’s gone to bed'). Unlike more formal alternatives like 就寝 (jiùqǐn), 上床 is conversational and widely appropriate across age groups and contexts — as long as tone and context remain innocent and routine-focused.