Even if the content of your dreams isn't hot or steamy, slipping into rapid eye movement (REM) sleep might still warm you up from the inside, according to a new review.
But here's the confusing thing: In almost all mammals, non-REM sleep is followed by REM sleep, which is a state of very high brain activity, similar to waking. This would mean that right after toxins and synapses are cleaned up in the brain, they would simply be re-created.
On the other hand, this bizarre creature is a monotreme – a sort of middle ground between a cold- and warm-blooded animal. Under Siegel's hypothesis, this means the platypus would require more REM sleep to instead maintain a functional brain temperature as it dozes. As mammals that show no signs of undergoing REM sleep, dolphins might be an exception that proves the rule. These anomalies are thought to partake in uni-hemispheric sleep, where only one side of the brain falls asleep at a time. In these exceptional cases, the brain's temperature might not be as easily influenced by sleep because a 'space heater' is still going in one part of the 'room', reducing the need for episodic warm-ups.
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