point taken, although i think i'll leave the experiment for someone else to try!. I suppose that is a good reason for mammals with bad night vision; but what about animals that hunt at night, aswell as the day? they still sleep periodically.
i can understand that aswell, but i also cant see why we have to sleep
to replenish our brains in the first place. An animal with a brain that 'replenishes' as it is use, and so would never need to rest, would be at a much bigger advantage than animals that do rest. I would have thought that over time some animals would have developed to not need sleep as it would be so advantageous.
I guess in an indirect way i am asking why exactly do animals need sleep so badly in the first place.