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Decoding Dreams
Undeceptions with John Dickson
The Effects of Sleep on Cognitive and Emotional Behaviors
Every animal species we've ever studied sleeps or engages in something remarkably like sleep. But not all species have every stage of sleep, according to Matthew Walker's book Why We Sleep. It appears that while every species experiences non REM sleep, only birds and mammals have full blown REM sleep. Birds and mammals appeared later in the evolutionary timeline, which suggests that dream sleep is the new kid on the evolutionary block.
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