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Re: Evolution of sleep



I think Jura sums it up. Physical limit that selection
cannot overcome.

--- Jura <pristichampsus@yahoo.com> wrote:
 
> I'm not sure how far back sleep goes, but I know
> that
> insects get the "honour" of being included in this
> camp. Though the physiological processes that occur
> in
> vertebrate sleep, are completely different with
> insects (since they have a completely different
> physiology, I'm hardly surprised). As such, insect
> sleep usually gets labeled as: torpor. 
> 
> Nonetheless, insects demonstrate the same lack of
> mobility and decreased response to stimuli, that is
> seen in vertebrates when they sleep (i.e. they "shut
> down" just like the rest of us do).
> 
> Now, do insects dream? That's what I'd like to find
> out.

Hey, if their feet twitch, they are dreaming right?

> Aside from that, I'm left wondering if sleep is a
> common trait seen in all creatures that exhibit an
> ability to think (i.e. neurons capable of
> associating
> with each other). There was a recent article in Time
> magazine that dealt with sleep. The latest research
> on
> it would seem to confirm that it is a behaviour
> devoted, almost entirely, to the brain. As such, I'm
> wondering if sleep is a requirement for proper
> functioning of the associative neurons themselves.
> It
> would help explain why sleep is so prevalent across
> classes, and why the best some critters can do, is
> only turn off half of their brains at a time.
> 
> Jason
> 
> "I am impressed by the fact that we know less about
> many modern [reptile] types than we do of many
> fossil groups." - Alfred S. Romer
> 
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