This report concluded that bullfrogs do not sleep because even during the resting phase they never failed to show a change in respiratory responses after painful stimuli (cutaneous shock).

Do frogs never sleep?

Do frogs sleep? Nobody really knows! At this point in time, there has been very little research in frog sleep patterns. It is known that they close their eyes, but no confirming brain scans have determined whether or not they actually have a true sleep period.

Which animal can sleep for 3 years?

Snails need moisture to survive; so if the weather is not cooperating, they can actually sleep up to three years. It has been reported that depending on geography, snails can shift into hibernation (which occurs in the winter), or estivation (also known as 'summer sleep'), helping to escape warm climates.