Navigation Links
Why sleep? UCLA scientist delves into one of science's great mysteries
Date:8/20/2009

ants and simple microorganisms; these species have dormant states as opposed to sleep even though in many cases they do not have nervous systems. That challenges the idea that sleep is for the brain, said Siegel.

"We see sleep as lying on a continuum that ranges from these dormant states like torpor and hibernation, on to periods of continuous activity without any sleep, such as during migration, where birds can fly for days on end without stopping," he said.

Hibernation is one example of an activity that regulates behavior for survival. A small animal, Siegel noted, can't migrate to a warmer climate in winter. So it hibernates, effectively cutting its energy consumption and thus its need for food, remaining secure from predators by burrowing underground.

Sleep duration, then, is determined in each species by the time requirements of eating, the cost-benefit relations between activity and risk, migration needs, care of young, and other factors. However, unlike hibernation and torpor, Siegel said, sleep is rapidly reversible that is, animals can wake up quickly, a unique mammalian adaptation that allows for a relatively quick response to sensory signals.

Humans fit into this analysis as well. What is most remarkable about sleep, according to Siegel, is not the unresponsiveness or vulnerability it creates but rather that ability to reduce body and brain metabolism while still allowing that high level of responsiveness to the environment.

"The often cited example is that of a parent arousing at a baby's whimper but sleeping through a thunderstorm," he said. "That dramatizes the ability of the sleeping human brain to continuously process sensory signals and trigger complete awakening to significant stimuli within a few hundred milliseconds."

In humans, the brain constitutes, on average, just 2 percent of total body weight but consumes 20 percent of the energy used during quiet waking, so these
'/>"/>

Contact: Mark Wheeler
mwheeler@mednet.ucla.edu
310-794-2265
University of California - Los Angeles
Source:Eurekalert

Page: 1 2 3

Related biology news :

1. UK scientists working to help cut ID theft
2. Scientists show that mitochondrial DNA variants are linked to risk factors for type 2 diabetes
3. Comet probes reveal evidence of origin of life, scientists claim
4. Scientists link fragile X tremor/ataxia syndrome to binding protein in RNA
5. Male elephants get photo IDs from scientists
6. Scientists retrace evolution with first atomic structure of an ancient protein
7. Muscle mass: Scientists identify novel mode of transcriptional regulation during myogenesis
8. Carnegie Mellon scientists develop nanogels that enable controlled delivery of carbohydrate drugs
9. Clemson scientists shed light on molecules in living cells
10. Scientists tackle mystery mountain illness
11. T. rex quicker than Becks, say scientists
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/23/2014)... other chronic inflammatory disorders among people of lower socioeconomic ... exposure to the microbes that thrive in rural environments, ... published in the journal Clinical & Experimental Immunology ... have less access to green spaces may be more ... immune system dysfunction. , When our immune systems are ...
(Date:4/23/2014)... most in their mid-thirties and forties, face a ... within two decades. "Mutant" protein clusters, long blamed ... been the primary focus of therapies in development ... from Prof. Gerardo Lederkremer and Dr. Julia Leitman ... and Immunology, in collaboration with Prof. Ulrich Hartl ...
(Date:4/23/2014)... Valley, NY. (Apr. 23, 2014) People who have ... potential to restore neurological function. However, a study conducted ... issue of Cell Transplantation , but is currently ... http://www.ingentaconnect.com/content/cog/ct/pre-prints/content-ct1168Chen , has found that when one group ... cells (PBSCs) injected directly into the brain and a ...
Breaking Biology News(10 mins):Rural microbes could boost city dwellers' health 2Rural microbes could boost city dwellers' health 3On the defensive 2On the defensive 3Autologous stem cell therapy improves motor function in chronic stroke victims 2
... relocation of an Inuit village already underway, some 400 ... in Alaska for a UN-affiliated conference April 20-24 to ... to both mitigate and adapt to climate change. ... Global Summit on Climate Change is also designed to ...
... Biology 2009 meeting in New Orleans, Dr. Kristine ... Control Technologies Branch of the Health Effects Laboratory ... results from the first study to directly link ... with exposure to different vibration frequencies with biological ...
... grew warmer from 18,700 to 10,000 years ago, juniper trees ... of their favorite food. Now, University of Utah biologists have ... eat toxic creosote bushes that replaced juniper. "It was ... Dearing, senior author of the study, published online Tuesday, April ...
Cached Biology News:Indigenous peoples at world summit to share climate change observations, coping techniques 2Indigenous peoples at world summit to share climate change observations, coping techniques 3Indigenous peoples at world summit to share climate change observations, coping techniques 4Indigenous peoples at world summit to share climate change observations, coping techniques 5Indigenous peoples at world summit to share climate change observations, coping techniques 6Risk of vibration-induced vascular injuries linked to vibration frequency differences 2Poison: It's what's for dinner 2Poison: It's what's for dinner 3Poison: It's what's for dinner 4Poison: It's what's for dinner 5
(Date:1/15/2014)... (PRWEB) January 15, 2014 2013 was ... Scottsdale’s Brain State Technologies®. They saw continued independent research ... Center who were awarded a $1 million grant from ... in “Brain and Behavior” a peer reviewed journal, Amy ...
(Date:1/14/2014)... Doylestown, PA (PRWEB) January 14, 2014 Date: ... p.m. , Location: Warrington Country Club, 1360 Almshouse Road, Warrington, ... only national nonprofit organization solely dedicated to finding a cure ... those affected worldwide, will host its annual Crystal Ball on ...
(Date:1/14/2014)... As pet owners drew up their lists of New Year,s ... better care of my furry companion." Nowadays there are pet salons, ... cases to take the little canine or feline darlings along wherever ... buy some pricey toys at the pet store. But anyone who ...
(Date:1/14/2014)... iLab Solutions, the leader in core facility management ... Product Strategy. In this role, Michelle will work with current ... in the development of iLab products. Her main goal will ... to the scientific community by offering the most advanced, user-friendly, ...
Breaking Biology Technology:Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 2Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2New Year's Resolution: Give Pets the Gift of Top-Notch Health Care 2iLab Solutions Announces Michelle Detwiler as the New Director of Product Strategy 2
... - GeneNews Limited (TSX: GEN), a company focused on ... diseases and personalized health management, today announced that it ... being held at the Sheraton Centre in Toronto from ... booth # 400, will feature the Company,s lead product, ...
... and CAMBRIDGE, England, November 26 Sosei,Group Corporation ("Sosei"; ... it has out-licensed its IP and Know How,relating to ... a,Cambridge, UK based pharma company, for the treatment and ... Mefloquine is a highly efficacious anti-malarial drug that is ...
... CAS REGISTRY, the world,s most,authoritative collection of disclosed chemical ... CAS Registry Number(R),1073662-18-6 recently was assigned to an azulenobenzofuran ... http://www.newscom.com/cgi-bin/prnh/20081125/CLTU095 ) , ... The 40 millionth substance ...
Cached Biology Technology:GeneNews to exhibit ColonSentry(TM) at Family Medicine Forum 2008 2Sosei Announces the Out-licensing of RS(+) Mefloquine to Treague Ltd for the Treatment and Prophylaxis of Malaria 2CAS Registers 40 Millionth Substance in CAS REGISTRY(SM) 2
... HistoMark Biotin Streptavidin-HRP Systems provide ... and intracellular antigens in frozen or ... These systems also facilitate double ... can be performed simultaneously with primary ...
...
... Polystyrene covers can be used ... Ridged covers for stacking of ... covers for use with automated ... ridged and non-ridged, are available ...
... Versatile, modular, computer controlled pre-amplifier suitable for ... isolated electrode input for recording physiological signal ... and a transducer input for use with ... transducers. Additional options include a stimulus artefact ...
Biology Products: