
Nocturnal
Night Activity
Nocturnal refers to being active or occurring in the night, opposed to daytime.

The museum offers nocturnal tours during the summer evenings.
Human Sleep Patterns
Humans are generally not nocturnal, but some people may work at night or have nocturnal hobbies.

Since becoming a security guard, Mark has adapted to a nocturnal schedule.
Environment Adaptation
Nocturnal creatures are adapted to life in the dark, possibly to avoid predators or the heat.

Desert rodents are mostly nocturnal to escape the daytime heat.
Compare with
DarkInsomniacLateNocturneShadowyTwilight
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