寝 （ネ） sleep

寝具 （シング） bedding, bedclothes

寝る （ねる） to sleep (lying down), to go to bed, to lie in bed, to lie down, to sleep (with someone, i.e. have intercourse), to lie flat (e.g. of hair), to lie idle (of funds, stock, etc.), to ferment (of soy sauce, miso, etc.)

寝る子は育つ （ねるこはそだつ） sleep brings up a child well, a well-slept child is a well-kept child

寝かす （ねかす） to put to sleep, to lay (something) on its side