寢
シン, ね.る, ね.かす, い.ぬ, みたまや, や.める

sleep, rest, bed chamber

JLPT0 G13 S0 F5000

The addition of 宀 roof/building to 侵 (deep) indicated a room crammed deep into the corner of a house. 寢 combines an abbreviated form# of this element + 爿 long, wooden sleeping pallet → *lie down*/*sleep* in a *back/inner room* → *lay down*; *go to bed*. Also, *leave* (unused).

[Full Kanji Etymology List]