Did You Know!
The Brain Shrinks Slightly Every Night—Then Re-Expands by Morning
During deep sleep, brain cells actually shrink by up to 60%, allowing cerebrospinal fluid to flush out metabolic waste more efficiently. This process—linked to the brain’s waste-clearance system—helps remove proteins associated with cognitive decline. By morning, the brain rehydrates and returns to normal size, which is one reason quality sleep is so critical for long-term brain health.
