What Happens While We Sleep

Dr. Laura Lewis and her team of researchers at Boston University found out that during deep sleep, toxic compounds in the brain like beta amyloid, found in the brains of Alzheimer’s patients, were wiped out.

Lewis wondered why this process only took place during sleep and more importantly, what mechanics were involved. She suspected the source to be cerebrospinal fluid, a clear, watery substance that flows around the brain using valves.