Nightcrawler is a term that typically refers to a type of earthworm that comes out at night. However, there are several synonyms for this word that can be used to describe other creatures or behaviors associated with the night. These synonyms include night owl, insomniac, nocturnal animal, nightjars, and dusk dwellers. Night owls are people who tend to stay up late and prefer to be active during the night. Insomniacs are people who have trouble sleeping at night and often stay awake to work or socialize. Nocturnal animals are creatures that are active at night, such as bats, owls, and raccoons. Nightjars are birds known for their distinctive nocturnal calls, and dusk dwellers are animals that come out at the transition period between day and night.