Do spiders sleep? Study suggests they may snooze like humans
It's a question that keeps some scientists awake at night: Do spiders sleep?
It's a question that keeps some scientists awake at night: Do spiders sleep?
Plants & Animals
Aug 8, 2022
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485
On Valentine's Day, couples all over the world will enjoy romantic dinners to celebrate love and relationships. The association between nutrition and mating is not unique to humans but is reflected across species throughout ...
Molecular & Computational biology
Feb 9, 2022
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166
Researchers at the Stanford University School of Medicine have found that neural signatures in sleeping zebrafish are analogous to those of humans, suggesting that the brain activity evolved at least 450 million years ago, ...
Evolution
Jul 10, 2019
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94
A team of researchers from several institutions in Hungary has found that dogs, like humans, very often have sleep problems after experiencing emotional difficulties. In their paper published in Proceedings of the Royal Society ...
Researchers report December 22 in the journal Current Biology that the more time reindeer spend ruminating, the less time they spend in non-rapid eye movement (non-REM) sleep. EEG recordings revealed that reindeer's brainwaves ...
Plants & Animals
Dec 22, 2023
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204
Flat-faced dog breeds are popular all over the world. In the U.S. and in Hungary, the French bulldog is currently the most common breed. However, their popularity comes at a high cost in terms of health: Shortened skulls ...
Plants & Animals
Dec 13, 2023
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36
Before heading to work each day, most people have spent the night dreaming. Studies show that on any given morning, about 40% of the working population recalls their dreams.
Economics & Business
Aug 28, 2023
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57
Researchers at the Department of Ethology at Eötvös Loránd University, Hungary, have measured the sleep of the dog's wild counterpart, the wolf, for the first time. Their new study was published in Scientific Reports.
Plants & Animals
Jul 11, 2022
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287
Sleep deprived Australian magpies are tired and unmotivated, just like humans, according to new research from La Trobe University in Melbourne which has found that, after a poor night's sleep, the common black and white songbird ...
Plants & Animals
May 3, 2022
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22
Octopuses are known to sleep and to change color while they do it. Now, a study publishing March 25 in the journal iScience finds that these color changes are characteristic of two major alternating sleep states: an "active ...
Plants & Animals
Mar 25, 2021
0
1999
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.
This text uses material from Wikipedia, licensed under CC BY-SA