7 Animals That Don't Sleep

Bullfrogs: Bullfrogs are able to stay awake for long periods of time during the breeding season in order to protect their eggs and tadpoles.

Dolphins: Dolphins are known to sleep with one eye open, as they need to come to the surface to breathe.

Giraffes: Giraffes only need between 10 minutes to 2 hours of sleep per day, and they usually nap standing up.

Horses: Horses only need around 2 to 3 hours of sleep per day and often take naps while standing up.

Jellyfish: Jellyfish do not have a brain and therefore do not sleep. They are able to survive without rest as long as they have access to food.

Sharks: Sharks are able to swim continuously without resting, and some species are known to rest while swimming.

Elephants: Elephants only sleep for around 2 to 3 hours per day and often nap standing up.