The Glymphatic System
Your brain has a sewer that only runs at night — miss sleep and you're swimming in your own waste.
Grounded in the research on glymphatic system
Prioritize deep sleep
The glymphatic system is a network of fluid channels wrapped around brain blood vessels. While you sleep, cerebrospinal fluid flushes through brain tissue and carries out metabolic waste — including amyloid-beta and tau, the proteins that accumulate in Alzheimer's disease. It's your brain's overnight sanitation crew. Maiken Nedergaard's lab at University of Rochester named and described it in a landmark 2013 Science paper. It runs almost exclusively during sleep.
Sleep on your side
Body position during sleep genuinely affects glymphatic efficiency. A 2019 study in the Journal of Neuroscience found that the lateral (side-sleeping) position cleared waste more effectively than sleeping on your back or stomach. The mechanism: glymphatic flow follows a specific pressure gradient that lateral positioning optimizes. Most people naturally side-sleep, but if you're a back sleeper who wakes foggy, this is worth experimenting with.