Japan
The USA
Korea
Guatemala
The United kingdom
Argentina
Scandinavia
Australia
China
Sleeping with no clothes help have a good night sleep.
Large groups of people sleep together.
Mirrors are not allowed during sleeping
Children sleep with "worry dolls" under their beds.
Children go to sleep very late.
People sleep with their pets.
babies have naps outside.
You may die if you fall asleep next to an electric fan.
Having a nap in the office is a sign of hardwork.