Friday, 1 November 2019 Why do we sleep? Lesley Stahl visits sleep labs to find out, and learns that sleep is as essential to our health as nutrition and exercise. In fact, scientists now see a link between lack of sleep and serious conditions such as diabetes, obesity and heart disease.
Boston University researchers captured the first-ever images of a watery liquid that washes in and out of our brains while we sleep. The findings could provide insight into disorders associated with disrupted sleep.