Well, this is sorta true. You see, when you're awake, your brain is constantly working to understand what is going on around you. When you sleep, you aren't aware of your surroundings because your brain is "refreshing" so to speak in order for you to fell ready to go when you wake up. This doesn't mean your brain completely shuts down though. If that happened, you'd die in your sleep! After all, your brain "still controls many body functions including breathing" while you dream (sleepfoundation.org). As you sleep, you eventually enter REM sleep, in which "dreams occur, breathing and heart rate increase and become irregular, muscles relax, and eyes move back and forth under the eyelids" (sleepfoundation.org). In order for all this to happen however, your brain must be working and at least somewhat active to allow for movement. So there. Your brain is active when you sleep.
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