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:7/11/2014)... Researchers from Salk Institute for Biological Studies, BGI, ... the safety and reliability of the existing targeted ... method, TALEN-HDAdV, which could significantly increased gene-correction efficiency ... study published online in Cell Stell Cell ... cell-based gene therapy. , The combination of stem ...
(Date:7/11/2014)... July 11, 2014 Researchers have pioneered a ... The new technology, called Virtual Finger, allows scientists ... like neurons and synapses using the flat surface ... makes 3D imaging studies orders of magnitude more ... unprecedented level across many areas of experimental biology. ...
(Date:7/11/2014)... is evidence that under the normal circumstances, ... development, maintain neuronal environment, and exhibit therapeutic ... neurodegenerative disease. Previous studies have found that ... after chemical induction have reduced viability, which ... Prof. Xiaodong Yuan, Kailuan General Hospital, Hebei ...
Breaking Biology News(10 mins):A new genome editing method brings the possibility of gene therapies closer to reality 2Virtual finger enables scientists to navigate and analyze complex 3D images 2
... varieties with higher yields and enhanced nutritional content, researchers ... with scientists at nine other institutions in an attempt ... endeavor, led by researchers at the U.K.-based Biotechnology and ... in the journal Nature . "This work ...
... release is available in Spanish . WASHINGTON, ... as part of an international team have completed a "shotgun sequencing" ... Nature reported today. The achievement is expected to increase ... wheat varieties with enhanced nutritional value. "By unlocking the ...
... code of one of the world,s most important crops. The ... genome, published today in Nature , is a major ... better able to cope with disease, drought and other stresses ... wheat genes, and insights into the links between them, lays ...
Cached Biology News:UC Davis researchers aid effort to sequence the complex wheat genome 2USDA scientists and cooperators sequence the wheat genome in breakthrough for global food security 2USDA scientists and cooperators sequence the wheat genome in breakthrough for global food security 3Major breakthrough in deciphering bread wheat's genetic code 2Major breakthrough in deciphering bread wheat's genetic code 3Major breakthrough in deciphering bread wheat's genetic code 4
(Date:7/11/2014)... 2014 /CNW/ - Sunovion Pharmaceuticals Canada Inc. (Sunovion) today ... acetate) for use as a once-daily adjunctive therapy for ... who are not satisfactorily controlled with conventional therapy.  APTIOM ... under 18 years of age. Epilepsy ... according to Epilepsy Canada, it affects 0.6% of the ...
(Date:7/10/2014)... 2014 Product and process impurities ... abundance and are often “lost in the noise,” ... Join presenters Dr. Rowel Tobias, Senior Scientist, Protein ... Head of Quality at Nanotherapeutics, Inc., to lear ... speed detection and quantitation while achieving the required ...
(Date:7/10/2014)... 2014 Unraveling life’s mysteries can intrigue, ... Archer Family purchased a DNA test to ... up with a lifetime of memories, sharing, and closeness. ... members’ DNA genuinely brought the family closer together. ... into genetic history and prior to taking the ...
(Date:7/10/2014)... (PRWEB) July 10, 2014 Senior supply ... and professional associations, addressed the challenges of “Reducing Cost, ... Device Industries” through strategic sourcing. Describing the partnership of ... the Supply Chain Management Institute ( SCMI) of ... on June 24 at the Kroc Institute of Peace ...
Breaking Biology Technology:Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 2Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 3Sunovion Pharmaceuticals Canada Inc. Announces Health Canada Approval of APTIOM(TM) (eslicarbazepine acetate) as a Once-Daily Adjunctive Treatment for Partial-Onset Seizures in Patients with Epilepsy 4Novel Ms Techniques Speed Detection of Biopharmaceutical Product and Process Impurities, New Webinar Hosted by Xtalks 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 2Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 3Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 4Ancestry DNA Test Reveals a Controversial and Undiscovered Family History 5Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 2Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 3Biotech & Biopharm Supply Chain Management Executives Launch BSMA in San Diego 4
... sunlight at a modest cost is a challenge with ... paper in a special energy issue of Optics ... a relatively new approach to solar cells: lacing them ... the article, this approach has the potential to greatly ...
... GREENBELT, Md. - Engineers at the University of Idaho ... in upcoming NASA missions that will study the Earth ... of a grant technical officer Pen-Shu Yeh, a senior ... the engineering team at the University of ...
... Md. - Engineers at the University of Idaho have ... upcoming NASA missions that will study the Earth and ... a grant technical officer Pen-Shu Yeh, a senior engineer ... engineering team at the University of Idaho,s ...
Cached Biology Technology:Enhancing solar cells with nanoparticles 2New one-of-a-kind technology will fly on 2 NASA missions 2New one-of-a-kind technology will fly on 2 NASA missions 3New one-of-a-kind technology will fly on two NASA missions 2New one-of-a-kind technology will fly on two NASA missions 3
... The VSOS-4 Orbital Shaker is designed to ... provide a uniform motion that is both mixing ... VSOS-4 Orbital Shaker provides a smooth, quiet, reproducible ... a wide range of laboratory applications such as ...
... Titer Kit is designed for determination of baculovirus ... days as in other methods. Classical determination of ... plaques, but the FastPlax Kit takes advantage of ... glycoprotein on the cell surface as early as ...
... state-of-the-art software for all your biopharmaceutical applications ... a single, scalable software package. The graphical ... the control of all Freedom instruments from ... 100 with one liquid handling arm up ...
... Kit is an advanced system for isolating DNA from ... be used directly for any downstream application. ... to use in 56 minutes Low melting point ... and TBE gels No specialised equipment required ...
Biology Products: