The Midnight Hour

WHY ARE HEDGEHOGS NOCTURNAL?

The hedgehog is well protected from predators by its spiny coat, so there seems to be no reason why it should be active only at night. But, biologically speaking, nocturnal activity has always been the norm for mammals.

The main reason for the hedgehog's night-time roamings is that its food is mostly nocturnal too. The creatures it eats are small invertebrates that are active at night to avoid other predators, or must keep out of the heat of the sun to avoid water loss.
Info from "Everything You Want To Know about Hedgehogs - Dilys Breese"

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