Staying up late is a science: Scientists say the brain turns on ‘auto-cleansing’ during sleep

Scientists at Boston University filmed the brain’s own cleansing process, according to foreign media. Red is blood and blue is cerebrospinal fluid. Blood periodically flows out of the brain in large quantities, and cerebrospinal fluid pours in to remove toxins. During sleep, neurons move in sync, causing periodic changes in the brain’s blood oxygen levels, scientists say. When awake, neurons do not go the same way, which makes it impossible to keep the blood level of the brain low enough.


Therefore, such cleaning, only after falling asleep can be done, otherwise cerebrospinal fluid can not take advantage of the inflated. The toxins that are removed include beta-amyloid, which is a major cause of Alzheimer’s disease.

The researchers point out that sleep is divided into three stages: shallow sleep, deep sleep, and rapid eye movement sleep (REM), which usually occurs in the fast eye movement sleep phase.

The study was a very important stage for the brain to preserve memory, either in the non-rapid eye movement sleep phase, when it was not time to dream. This further confirms that brain aging and local brain atrophy are associated with reduced slow-wave activity during non-rapid eye movement sleep.

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