A new study by an interdisciplinary team of researchers at The University of Texas at Austin provides what may be the most reliable validation to date of the connection between physical activity, sleep quality and psychological ...
Apr 1, 2024
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A new study by researchers at the University of Arizona Health Sciences identified a link between poor sleep and migraine attacks that suggests improving sleep health may diminish migraine attacks in people with migraine.
Mar 13, 2024
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Dreams are excursions of our central nervous system, unfolding when the body is at rest, but our brains are in thrall to rapid eye movement (REM) sleep. For people with a rare condition, their whole body acts out the dream, ...
Mar 1, 2024
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Dementia is a progressive loss of cognitive abilities, such as memory, that is significant enough to have an impact on a person's daily activities.
Mar 1, 2024
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In the adrenaline-packed world of professional sports, the power of sleep rarely gets adequate attention.
Jan 31, 2024
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A team of neuroscientists and sleep researchers at E.P. Bradley Hospital Sleep Research Laboratory, working with colleagues from Brown University and Providence VA Medical Center, has found that rather than improving sleep, ...
Nina Shand couldn't stay awake. She had taken afternoon naps since she was a teenager to accommodate her "work hard, play hard" attitude, but when she was in her mid-20s the sleepiness became more severe.
Jan 8, 2024
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In his sci-fi film "Inception," (2010), Christopher Nolan imagined his protagonist slipping into other people's dreams and even shaping their contents. But what if this story wasn't so far away from real life?
Jan 4, 2024
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If you're having trouble sleeping, perhaps contact with a bedmate is causing the problem, say University of Michigan researchers.
Dec 27, 2023
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Nearly three-quarters of high school students do not get enough sleep on school nights, according to the Centers for Disease Control and Prevention.
Dec 18, 2023
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Rapid eye movement (REM) sleep is a normal stage of sleep characterized by rapid movements of the eyes. REM sleep is classified into two categories: tonic and phasic. It was identified and defined by Kleitman and Aserinsky in the early 1950s.
Criteria for REM sleep includes not only rapid eye movements, but also low muscle tone and a rapid, low voltage EEG -- these features are easily discernible in a polysomnogram, the sleep study typically done for patients with suspected sleep disorders.
REM sleep in adult humans typically occupies 20-25% of total sleep, about 90-120 minutes of a night's sleep. During a normal night of sleep, humans usually experience about 4 or 5 periods of REM sleep; they are quite short at the beginning of the night and longer toward the end. Many animals and some people tend to wake, or experience a period of very light sleep, for a short time immediately after a bout of REM. The relative amount of REM sleep varies considerably with age. A newborn baby spends more than 80% of total sleep time in REM. During REM, the activity of the brain's neurons is quite similar to that during waking hours; for this reason, the sleep stage may be called paradoxical sleep. This means that there are no dominating brain waves during REM sleep.
REM sleep is physiologically different from the other phases of sleep, which are collectively referred to as non-REM sleep (NREM). Vividly recalled dreams mostly occur during REM sleep.
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