Snail can sleep for 3 years.The reason snails sleep are they alike many other animals hibernate. Hibernation means that snails sleep when weather becomes excessively cold; it is a necessary for the survival of snails.
It is also been known some species of desert snails can do this for years before actually dying.Snails common diet are plants and other vegetation. Snails will bury themselves in the ground and close their shells off with their own slime. You can find them eating live plants, dying plants, rotting plants, fruits, and algae. A snail has a radula located inside its mouth to assist in the grinding of its food.