寝室
qǐnshì · HSK 7
sleeping room
🛏️ 寝 sleep + 室 room = the room where you sleep, a bedchamber
寝 means to sleep or rest; 室 means room or chamber. Put together, 寝室 is literally the sleep-room. The same 室 shows up in 教室 (classroom) and 办公室 (office).
室 — roof 宀 + arrive 至
A semantic compound: 宀 (roof/house) over 至 (to arrive). The image is a place one arrives at and stays in — an inner room. From 'inner chamber' the meaning broadened to 'room' generally, and by extension to specialized rooms like an office or laboratory.