Why do we close our eyes when we sleep

because our some of the energy goes from our eyes

explanation;

There are several reasons why it's important to close our eyes while we sleep. Closed eyelids block light, which stimulates the brain to wakefulness. Closing our eyes also protects and lubricates the eyes while we sleep

The apparatus stems from a wooden horse introduced by the Romans and used to teach mounting and dismounting. They added it to the ancient Olympic Games. The basic modern exercises were developed in the early 19th century by Friedrich Ludwig Jahn, founder of the German turnverein.