Of the two basic states of sleep, the one that increases after physical exertion, helps us recover from bodily fatigue, and is dream free about 90 percent of the time is __________ sleep.

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The Answer of Of the two basic states of sleep, the one that increases after physical exertion, helps us recover from bodily fatigue, and is dream free about 90 percent of the time is __________ sleep.

Of the Two Basic States of Sleep, the One That