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Please note: This is a companion version & not the original book. Book Preview: #1 Your brain doesn t shut down when you sleep, it just slows down. It even dreams and reorganizes memories while you re in there! Waking up is no easy task, but one we all have to do sooner or later, and the average adult spends about 25 percent of their sleep time in REM (rapid eye movement) sleep. -> The brain doesn t shut down when you sleep, it just slows down. It even dreams and reorganizes memories while you re in there. Waking up is no easy task, but one we all have to do sooner or later.#2 The brain doesn t shut down when you sleep, it just slows down. It even dreams and reorganizes memories while you re in there. Waking up is no easy task, but one we all have to do sooner or later.#3 We don t know if sleep is good for us, but we do know that sleep deprivation can be dangerous.#4 Sleep is important for several reasons. It replenishes us, boosts our health, and allows the brain and body to tidy up and prepare for the next day.