The Hidden Power of Sleep: The System That Washes Your Brain Every Night

Every night a cleaning crew activates inside your skull: the glymphatic system, flushing Alzheimer's-linked toxins while you lie unconscious. A landmark study tracking tens of thousands of sleepers revealed the real variable isn't eight hours—it's consistency. Irregular bedtimes inflict perpetual jet lag without a plane. The first half of night handles physical repair; the second half consolidates memory and resets emotion. One short night adds 350 extra calories and mimics diabetic metabolism. This book exposes sleep as a survival system, not a luxury.

You'll learn:

- Why bedtime regularity outweighs total hours slept

- How the glymphatic system clears brain toxins only during deep sleep

- The metabolic cost of a single four-hour night