Sleepy

sg at vax.oxford.ac.uk sg at vax.oxford.ac.uk
Mon Feb 27 03:37:53 EST 1995


In article <3002945679.1.p00511 at psilink.com>, "Jim Chinnis" <p00511 at psilink.com> writes:
> Justin Baker writes:
> 
>>At night, a diurnal animal is vulnerable to predation.  Right.  If it is
>>out and about, it will get eaten.  If it is hiding away in a warm place,
>>expending little energy, it will likely save itself from probable death.
>>In fact, if one considers the probabilities of predatory attack for
>>a diurnal species at night, it soon becomes obvious that by sleeping,
>>the species increases its evolutionary potency a good bit.
> 
>>There may be obvious gaps in this theory, but overall I find that is a
>>useful one.  It also has some interesting preadaptive implications,
>>which may or may not be obvious.  I will not pursue those here.
> 
>>I would appreciate any comments.

> 
> Why do tigers, lions, and so many ferocious beasts sleep so darn much?

Also why dolphins, in order to avoid complete falling asleep and drowning,
sleep with one hemisphere at a time, rather than live without sleep at all? 



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