Definition: happening during the nighttime hours
Part of Speech: Adjective
Synonym(s): nightly, after dark
Antonym(s): early (near)
1. Because the bat is nocturnal, it’s usually awake during the late night hours.
2. I’m not nocturnal because I enjoy sleeping all night long.
3. Fortunately the new baby is a nocturnal sleeper who shares the family’s nightly sleeping hours.