TWICE Nayeon, the secret of "Roadside Nap". As a result of the study, sleeping time of animals,

* Elephant: 3 hours,

* Cattle: 4 hours,

* Human: 8 hours,

* Dog, cat: 12 hours,

* Squirrel, hamster: 14 hours.

Among mammals, squirrels and other "front rodents" characterized by front teeth are sleeping long time, but have special ecology which repeats a short sleep of about 10 minutes in the daytime. .