As we all know, marine animals like dolphins fall in sleep with just parts of the brain being “offline” state. The similar phenomenon is also found in people. The study from Stanford neuroscientists shows that the same cycles of oscillating brain activity during sleep also occur during a waking state. This means that parts of the brain independently “fall asleep” and “wake up” when we are awake. The study also shows that neurons are at active state with more time when we are pay attention to something. Just as Dr. Tatiana Engel says, attention and arousal are interdependent.

Some studies on mice show that the mouse brain is clearing out the waste generated at the active state when sleeping or under anesthesia. These studies also show that waste is be cleaned out two times faster when the brain falls asleep.

The above studies show that our brains doesn’t fully fall in sleep when we are asleep.

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