御寝小[onesho] bed-wetting
ぐうぐう寝ちゃう[guuguunechau] to fall sound asleep
一寝入り[hitoneiri] nap
一人寝[hitorine] sleeping alone
仮寝[karine] siesta

果報は寝て待て[kahouhanetemate] All things come to those who wait
泣き寝入り[nakineiri] crying oneself to sleep
居間兼寝室[imakenshinshitsu] living room and bedroom
共寝[tomone] sleeping together
就寝[shuushin] going to bed

一首[isshu] tanka
鎌首[kamakubi] sickle-shaped neck (e.g. snake, praying mantis)
丸首[marukubi] round-necked (T-shirt)
偽首[nisekubi] falsified severed head
カリ首[karikubi] (something resembling a) goose's neck

がん首[gankubi] head of a pipe, incl. the bowl and stem attachment
機首[kishu] nose (of plane)
襟首[erikubi] nape of neck
元首[genshu] ruler
絞首刑[koushukei] death by hanging