situated in the middle; central; main; in the center

(bound form) a bedroom or living chamber; specifically used for the private quarters of ancient emperors or the main hall of an ancestral temple

correct; orthodox; standard; right; honest or upright in character

(bound form) to sleep; to lie down to rest; relating to sleep as in 寝室 qǐn​shì or 寝具 qǐn​jù