This is still a question with many loose fringes that scientists are trying to tie.
Some experts say that we sleep so that the brain processes all the information received during wakefulness and so that the body gets rid of metabolic waste and free radicals, chemical entities that are believed to affect cellular aging and even cause cancer.
Other researchers argue that we sleep to dream : prolonged sleep deprivation can cause the insomniac to daydream, that is, to have hallucinations.
