REM sleep first occurs about 90 minutes after falling asleep. Behind closed eyelids, your eyes dart rapidly from side to side. Mixed frequency brain wave activity becomes closer to that seen in wakefulness. Your breathing becomes faster and irregular, and your heart rate and blood pressure increase to near waking levels. Most of your dreaming occurs during REM sleep, although some can also occur in non-REM sleep.
Siegel says the findings suggest a previously unobserved relationship between body temperature and REM sleep, a period of sleep when the brain is highly active. Published recently in, the study was authored by Prof. Siegel, who directs the Center for Sleep Research at the Jane and Terry Semel Institute for Neuroscience and Human Behavior at UCLA.
Birds have the highest body temperature of any warm-blooded, or homeotherm, animal group at 41°C while getting the least REM sleep at 0.7 hours per day. That’s followed by humans and other placental mammals , 2 hours of REM sleep), marsupials , and monotremes . Brain temperature falls in non-REM sleep and then rises in REM sleep that typically follows. This pattern “allows homeotherm mammals to save energy in non-REM sleep without the brain getting so cold that it is unresponsive to threat,” Siegel said.
The amount of humans’ REM sleep is neither high nor low compared to other homeotherm animals, “undermining some popular views suggesting a role for REM sleep in learning or emotional regulation,” he said.The Lancet
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Sleep Paralysis: Causes, Symptoms & TreatmentNicoletta Lanese is a staff writer for Live Science covering health and medicine, along with an assortment of biology, animal, environment and climate stories. She holds degrees in neuroscience and dance from the University of Florida and a graduate certificate in science communication from the University of California, Santa Cruz. Her work has appeared in The Scientist Magazine, Science News, The San Jose Mercury News and Mongabay, among other outlets. But how else am I supposed to see the sleep demon
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