Sleep accounts for one-quarter to one-third of the human lifespan. But what exactly happens when you sleep? Before the 1950s, most people believed sleep was a passive activity during which the body Ò€¦

During sleep, there is a marked decrease in muscle activity and Ò€¦ Getting a good nightÒ€ℒs sleep every night is vital to cardiovascular health. Adults should aim for an average of 7-9 hours, and babies and kids need more depending on their age. Too little or too much Ò€¦