https://www.mysterious-times.com/2019/11/17/scientists-now-know-how-sleep-cleans-toxins-from-the-brain/

The synchronized brain waves of non-REM sleep may play a key role in preventing toxins from accumulating in a person’s brain.

Laura Lewis and her team of researchers have been putting in late nights in their Boston University lab. Lewis ran tests until around 3:00 in the morning, then ended up sleeping in the next day. It was like she had jet lag, she says, without changing time zones. It’s not that Lewis doesn’t appreciate the merits of a good night’s sleep. She does. But when you’re trying to map what’s happening in a slumbering human’s brain, you end up making some sacrifices. “It’s this great irony of sleep research,” she says. “You’re constrained by when people sleep.”

Her results, published today in the journal Science, show how our bodies clear toxins out of our brains while we sleep and could open new avenues for treating and preventing neurodegenerative diseases like Alzheimer’s…..(See link for full article)

For Lewis et al. study:

https://science.sciencemag.org/content/366/6465/628

Coupled electrophysiological, hemodynamic, and cerebrospinal fluid oscillations in human sleep