Getting enough deep sleep might be the key to preventing dementia. In a series of recent experiments on mice, researchers discovered that deep sleep helps the brain clear out potentially toxic waste. The discovery reinforces how critical quality sleep is for brain health and suggests sleep therapies might curb the advance of memory-robbing ailments, like Alzheimer’s disease.

“Alzheimer’s disease is a major problem for the patients, their families and society,” said Maiken Nedergaard, a ne