nocturnal

adj 1: (biology) belonging to or active during the night;

"nocturnal animals are active at night"; "nocturnal

plants have flowers that open at night and close by

day" [ant: {diurnal}]

2: of or relating to or occurring in the night; "nocturnal

darkness"

3: of or during or relating to the night; "a nocturnal

journey"; "nocturnal stillness"; "nocturnal predators"