7. Bats
Bats are famous for their upside-down slumber, hanging from their feet in dark caves or secluded trees. This unique position not only keeps them safe from many ground predators but also lets them launch into flight at a moment’s notice.
Some bat species are true sleep champions, clocking in as much as 20 hours of rest per day. Their extraordinary habits make them some of the most fascinating sleepers in the animal world. More info