A number of studies have linked poor sleep or lack of sleep to an increased risk of Alzheimer’s disease; one reason for this is because your brain’s waste removal system only operates during deep sleep
By pumping cerebral spinal fluid through your brain’s tissues, the glymphatic system flushes the waste from your brain back into your body’s circulatory system, from where it can be eliminated
During sleep, the glymphatic system becomes 10 times more active than during wakefulness. Simultaneously, your brain cells shrink by about 60 percent, allowing for greater efficiency of waste removal