Giraffes, like some other herbivores, sleep standing up. This way, they protect themselves from predators and, in the case of a sudden attack, they can run away without wasting time. Giraffes sleep a total of about 2 hours a day at 10-minute intervals.
The African elephant sleeps only 2-3 hours a day, in short intervals, usually standing up. If necessary, elephants can stay awake for a very long time — they can do without sleep for up to 46 hours.
Deer sleep 3 hours a day. They can rest both lying down and standing up but they are always alert.
Goats sleep about 5 hours a day, cows sleep 4 hours, and horses sleep even less, only about 3 hours. By the way, horses are able to dream just like humans.
The average dog sleeps 12 to 14 hours a day. Puppies can sleep 18 to 20 hours a day.
Although squirrels hibernate through the winter, they sleep about 15 hours a day even during their active season.
Domestic cats sleep an average of 15–16 hours a day, while tigers sleep up to 20 hours, resting after hunting.
Lemurs spend most of their time in trees and sleep about 16 hours a day.
Shrews have a life expectancy of about 4 years, and during this time they sleep about 16 hours a day.

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