夜分

(1)the period spent sleeping; "I had a restless night"

(2)眠って過ごす時間

(3)the time between sunset and midnight; "he watched television every night"

(4)日没から深夜までの時間

(5)the time after sunset and before sunrise while it is dark outside

(6)外が暗い、日没の後と日の出の前の時間