Credit: The health supplement
Sleeping/Sleep - A state of rest that is accompanied by reduced consciousness, is generally attributed to mammals because it is a state where neural/mental activities are reduced to a minimum excluding REM sleep. As seen from the reason, a neural network/brain must be involved for an organism to experience sleep and has been the line of thought of scientists in the previous years. However this line of thought is beginning to crumble as there have been discoveries in some organisms lacking a neutral network/brain that shows that sleep might not require the brain to explain it's existence/that from evolutionary perspective sleep might have evolved before the
Part credit: dreamstime
first neural networks/brain evolved and some scientists think this sleep is of great importance to metabolism. Read more