Which mammal spends the most time sleeping?

The Western European hedgehog spends the most of its time sleeping. During the summer, it makes a nest of grass and leaves under tree roots or under a bush and spends roughly 18 hours a day there. It awakens at night to feed, sniffing for worms, insects, snails, and snakes for dinner. It hibernates throughout the winter months. For safety, the hedgehog curls into a tight, spiky ball while sleeping or sensing danger. Sloths, armadillos, and opossums, for example, sleep nearly as long as hedgehogs, collecting up to 17 hours every day! Other sleepy creatures include the dormouse (approximately 17 hours), koalas (about 15 hours), and all types of felines, including household cats.

The European hedgehog (Erinaceus europaeus), commonly known as the West European hedgehog or common hedgehog, is a hedgehog species endemic to Europe, ranging from Iberia and Italy to Scandinavia and the British Isles. It is a widespread and widely dispersed species that can thrive in a variety of habitat types. It is a well-known species that is popular in European gardens because to its appealing look and penchant for consuming a variety of plant pests. While numbers are now constant over much of its range, it is rapidly dropping in the United Kingdom, where it is now Red Listed (classified as near to extinction). The species was brought to New Zealand in the late nineteenth and early twentieth century, outside of its natural habitat.