September 21, 2013
Mohenjo
Medical
amazon, bbc, bbc news, brain, brain cell, brain repair, Brain Science, brain's circuitry, business, Business News, Cell (biology), cell death, Death, Dr Chiara Cirelli, Hotels, immature oligodendrocytes, Journal of Neuroscience, Myelin, oligodendrocytes, rapid eye movement, rapid eye movement sleep, REM sleep, research, Science, Science News, Scientists, Sleep, sleep lab, stress responses, technology, Technology News, travel, University of Wisconsin, vacation, why we need to sleep, Wisconsin, wisconsin team, www bbc co uk, your brain
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Scientists believe they have discovered a new reason why we need to sleep – it replenishes a type of brain cell.
Sleep ramps up the production of cells that go on to make an insulating material known as myelin which protects our brain’s circuitry.
The findings, so far in mice, could lead to insights about sleep’s role in brain repair and growth as well as the disease MS, says the Wisconsin team.
The work is in the Journal of Neuroscience.
Dr Chiara Cirelli and colleagues from the University of Wisconsin found that the production rate of the myelin making cells, immature oligodendrocytes, doubled as mice slept.
The increase was most marked during the type of sleep that is associated with dreaming – REM or rapid eye movement sleep – and was driven by genes.
In contrast, the genes involved in cell death and stress responses were turned on when the mice were forced to stay awake.
Precisely why we need to sleep has baffled scientists for centuries. It’s obvious that we need to sleep to feel rested and for our mind to function well – but the biological processes that go on as we slumber have only started to be uncovered relatively recently.
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June 2, 2013
Mohenjo
Medical
alcohol, Alcohol And Insomnia, Alcohol And Sleep, Alcohol And Sleeping, Alcohol Effects, Alcohol Health Effects, Alcohol Side Effects, amazon, business, decent night, Drinking And Sleeping, Effects Of Alcohol, Effects Of Drinking, Health, Hotels, huffingtonpost, maing, medicine, mental-health, myaol, OWN Healthy Mind & Body, OWN News, peaceful slumber, research, Science, Science News, Sleep And Alcohol, sleep lab, slow wave sleep, technology, Technology News, travel, vacation
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We know that a nightcap — or three — won’t help us drift off into a peaceful slumber. But we didn’t know exactly why it sets us up for a restless, sweaty, snore-y, anxious night.
By Valerie Ross
Thanks to an April 2013 review of 20 studies — and to the more than 500 people who drank in the name of science and then turned in for the night in a sleep lab so that researchers could record their brainwaves — it’s been confirmed: If you only have a bit to drink, alcohol can help you sleep better during the first part of the night, spurring an increase in slow-wave sleep, which the body needs in order to repair tissues and strengthen the immune system, and leaving dream-studded REM sleep untouched. Too much booze, however, can interrupt REM sleep, which is vital for memory and concentration. As the alcohol wears off during the second part of the night, sleep is often disrupted, the review found, as people frequently wake up. (In some cases, they’ll also start sweating, feel anxious or — if they do manage to get some REM sleep — have nightmares.) But that’s only the beginning of how alcohol gets between you and a decent night’s rest.
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http://www.huffingtonpost.com/2013/05/17/alcohol-side-effects-drinking-sleep_n_3286434.html?1368797853&icid=maing-grid7|myaol|dl28|sec1_lnk3%26pLid%3D314816
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