How do sloths sleep in trees without falling out of the tree?

Sloths have a unique adaptation that helps them sleep securely in trees: their long, curved claws grasp branches tightly, allowing them to hang comfortably without using much energy. Additionally, their muscles are specially adapted to maintain a strong grip while they relax, which prevents them from falling. This grip is so effective that sloths can even sleep while hanging upside down without risk of dropping.