Carnivores like lions and tigers sleep either because it's so hot in the tropics that it doesn't make sense to be active all the time, especially during the middle of the day. Plus, by conserving energy via sleep, they can make a kill last longer in terms of energy/calories.
I have never heard of any substantial differences in sleeping-patterns between raw human omnivores and raw human carnivores, though(except in the transitional phase for successful RZCers, and, of course, raw omnivores who do badly on RZC like myself have to sleep longer because of the vast increase in chronic fatigue.There is some anecdotal evidence, though, to indicate that just going raw reduces the amount of sleep one needs to have(I think it's because cooked foods require more energy/resources from the boldy re digestion so that a cooked meal in the evening helps to prolong sleep so that the body can recover).
