As was seen in the How Much Sleep? thread in MPSIMS (I can’t find it) the amount of sleep an individual needs varies. In a given population of animals, would not those that needed less sleep have more time for gathering food, finding mates, drinking beer, etc.? There is a definite advantage to sleeping less. When one is sleeping, one is a bit more vulnerable to falling victim to nocturnal predators. There is a definite disadvantage to sleeping more. Would not those animals who sleep less have an advantage over their sleepy brethren? If need for sleep is a genetic trait, wouldn’t the proportion of night-owls in a population grow? Why then, has sleep not been relegated to the evolutionary backwaters?
[disclaimer] I don’t have any doubt that evolution is the driving force behind change over time. If I did, I would have asked this in the [Evidence"]http://www.straightdope.com/ubb/Forum7/HTML/000696.html]Evidence]( [url="http://www.straightdope.com/ubb/Forum7/HTML/000696.html) Against thread.[/disclaimer]
Once in a while you can get shown the light
in the strangest of places
if you look at it right…