Not all sleep is created equal, especially when it comes to protecting your brain. A new study published in the Journal of Clinical Sleep Medicine has revealed that getting less slow-wave sleep (deep sleep) and REM sleep is linked to smaller brain volume in key areas vulnerable to Alzheimer’s disease.
Researchers analyzed sleep studies and brain imaging data from 270 adults (average age 61), finding that those who spent less time in deep and REM sleep experienced more shrinkage in the inferior parietal region—a brain area that’s among the first affected by Alzheimer’s. Even after accounting for age, heart health, and lifestyle habits, the connection between poor sleep quality and brain atrophy remained strong.
Lead author Dr. Gawon Cho of Yale School of Medicine stated that “reduced neuroactivity during sleep may contribute to brain atrophy,” highlighting how sleep deficiency could be a modifiable risk factor for Alzheimer’s and cognitive decline.
What does this mean for you? It’s not just about getting enough hours of sleep—it’s about getting the right kind. Slow-wave sleep is essential for clearing toxins and repairing the brain, while REM sleep supports memory consolidation and emotional regulation. Skimping on these stages over time could put your brain at risk.
With more than 6.7 million Americans currently living with Alzheimer’s—and that number expected to double by 2060—protecting your brain with quality sleep has never been more important. Prioritize sleep hygiene, manage stress, and avoid late-night screen time to boost your chances of getting the deep, restorative sleep your brain needs.
