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 and brain were dormant. “But it turns out that sleep is a period during which the brain is engaged in a number of activities necessary to life—which are closely linked to quality of life,” says Johns Hopkins sleep expert and neurologist Mark Wu, M.D., Ph.D.
Researchers like Wu are spending many of their waking hours trying to learn more about these processes and how they affect mental and physical health. Here is a glimpse... (Read the full story here.)