News tagged with rem sleep
Getting a grip on sleep
All mammals sleep, as do birds and some insects. However, how this basic function is regulated by the brain remains unclear. According to a new study by researchers from the RIKEN Brain Science Institute, ...
Neuroscience
May 14, 2013 |
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Acting out dreams linked to development of dementia, study finds
The strongest predictor of whether a man is developing dementia with Lewy bodies—the second most common form of dementia in the elderly—is whether he acts out his dreams while sleeping, Mayo Clinic researchers have discovered. ...
Neuroscience
Mar 21, 2013 |
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Study reveals potential target to better treat, cure anxiety disorders
Researchers at Boston University School of Medicine (BUSM) have, for the first time, identified a specific group of cells in the brainstem whose activation during rapid eye movement (REM) sleep is critical for the regulation ...
Neuroscience
Mar 05, 2013 |
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Reviewing alcohol's effects on normal sleep
Sleep is supported by natural cycles of activity in the brain and consists of two basic states: rapid eye movement (REM) sleep and non-rapid eye movement (NREM) sleep. Typically, people begin the sleep cycle with NREM sleep ...
Health
Jan 22, 2013 |
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REM sleep enhances emotional memories, study shows
(Medical Xpress)—Witnessing a car wreck or encountering a poisonous snake are scenes that become etched in our memories.
Neuroscience
Dec 18, 2012 |
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Changes in sleep architecture increase hunger, eating
A new study shows that both length of time and percentage of overall sleep spent in different sleep stages are associated with decreased metabolic rate, increased hunger, and increased intake of calories (specifically from ...
Health
Oct 22, 2012 |
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Study identifies how muscles are paralyzed during sleep
Two powerful brain chemical systems work together to paralyze skeletal muscles during rapid eye movement (REM) sleep, according to new research in the July 11 issue of The Journal of Neuroscience. The finding may help scient ...
Neuroscience
Jul 11, 2012 |
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Smoking, head injury, pesticide use may be risk factors for rare sleep disorder
Smoking, head injury, pesticide exposure, farming and less education may be risk factors for a rare sleep disorder that causes people to kick or punch during sleep, according to a study published in the June 27, 2012, online ...
Neuroscience
Jun 27, 2012 |
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Sleepwalking more prevalent among US adults than previously suspected
What goes bump in the night? In many U.S. households: people. That's according to new Stanford University School of Medicine research, which found that about 3.6 percent of U.S. adults are prone to sleepwalking. The work ...
Neuroscience
May 14, 2012 |
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Dreamless nights: Brain activity during nonrapid eye movement sleep
(Medical Xpress) -- The link between dreaming and rapid eye movement (REM) sleep are well understood – but the fact that consciousness is reduced during nonrapid eye movement (NREM) sleep is not. Recently, ...
Neuroscience
Apr 09, 2012 |
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REM sleep disorder doubles risk of mild cognitive impairment, Parkinson's
People with symptoms suggesting rapid eye movement sleep behavior disorder, or RBD, have twice the risk of developing mild cognitive impairment (MCI) or Parkinson's disease within four years of diagnosis with the sleep problem, ...
Parkinson's & Movement disorders
Mar 14, 2012 |
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Dreaming takes the sting out of painful memories: study
They say time heals all wounds, and new research from the University of California, Berkeley, indicates that time spent in dream sleep can help.
Medical research
Nov 23, 2011 |
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Study shows different anesthetics affects sleep cycles in different ways
(Medical Xpress) -- In the ongoing quest to find the exact way that anesthetics interact with the central nervous system, anesthesiology researchers have been examining whether the state induced by anesthetics resembles natural ...
Sleep apnea
Oct 04, 2011 |
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REM sleep behavior disorder is a risk factor for Parkinson's disease
Patients suffering REM sleep behaviour disorders dream nightmares in which they are attacked and pursued, with the particularity that they express them by screaming, crying, punching and kicking while sleeping. Lancet Neurology ...
Parkinson's & Movement disorders
Jul 29, 2011 |
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Potential cause of severe sleep disorder discovered, implications for Parkinson's disease
Researchers at the University of Toronto are the first to indentify a potential cause for a severe sleep disorder that has been closely linked to Parkinson's disease and other neurodegenerative diseases.
Neuroscience
Jun 15, 2011 |
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Rapid eye movement sleep
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.
For more information about Rapid eye movement sleep, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
