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Originally posted by Vertu
As far as I know, sharks do sleep, but only a portion of their mind sleeps at a time. Is it true?
From experiments carried out on a small shark called the Spiny Dogfish (Squalus acanthias), we know that the 'Central Pattern Generator' that co-ordinates swimming movements in sharks is not located in the brain, but in the spinal chord. Thus, it is possible for an unconscious shark to swim.
There is even a possibility that the sharks' fore, mid-, and hind- brain shut down in sequence, resulting in the shark equivalent of sleep-walking.
apparently Jesus never slept.... all he ever did was meditate...
Originally posted by smallpeeps
Has any species evolved beyond the need for sleep?
what is Dawkins' theory of the selfish gene?
Anyone interested in how life has developed should read this book, and they will be amply compensated for their trouble by the fine writing Dawkins deploys to convey his very challenging argument.
"This book will show how both individual selfishness and individual altruism are explained by the fundamental law that I am calling gene selfishness." (p.6)
"I shall argue that the fundamental unit of selection, and therefore of self-interest, is not the species, nor the group, nor even, strictly, the individual. It is the gene, the unit of heredity." (p.11)
The selfish gene theory does not imply that biological, and therefore human, existence is basically selfish. Dawkins is well aware of co-operative behaviour and symbiosis. On the latter, he writes:
"In general, associations of mutual benefit will evolve if each partner can get more out than he puts in." (p.183)
Neither is Dawkins a genetic determinist: it is certainly feasible for us to modify, oppose or over-ride genetic pre-dispositions. One aspect of this is the role of memes. This invention of his is the notion of a self-replicating cultural unit, by analogy with the gene. The values that help memes and genes survive are the same: longevity, fecundity and copying-fidelity.
Originally posted by surfup
The main reason is that why should we?
In the case of rats, however, continuous sleep deprivation for about two weeks or more inevitably caused death in experiments conducted in Allan Rechtschaffen’s sleep laboratory at the University of Chicago. Two animals lived on a rotating disc over a pool of water, separated by a fixed wall. Brainwaves were recorded continuously into a computer program that almost instantaneously recognized the onset of sleep. When the experimental rat fell asleep, the disc was rotated to keep it awake by bumping it against the wall and threatening to push the animal into the water. Control rats could sleep when the experimental rat was awake but were moved equally whenever the experimental rat started to sleep. The cause of death was not proven but was associated with whole body hypermetabolism.
Originally posted by Partyof1
I'm sorry but this is blatantly false. There is NO such mutation. I'd like to see proof that there is ANYONE that does not require sleep to sustain life.
Originally posted by theRiverGoddess
Sharks ....(some, not all) must keep moving to keep the water pouring into the gills so they can breath. They do seam to go into stasis at times, like napping, but they never stop swimming. They do not ever REST.......so in a way they never sleep. They evolved on this planet.
Do ants sleep?
Seals and dolphins "sleep" with alternate hemispheres of their brains asleep and the other awake. Seals need to do this so they can breathe above water while sleeping. Migratory birds also seem to sleep this way.
Even fish and fruit flies appear to sleep. If fruit flies are repeatedly disturbed so that they can not sleep, later when allowed to sleep they will stay inactive for a longer period of time.
Asia Minor wrote:Snakes do not sleep neither do sharks.