nocturnal predator’s Sleep/wake cycle optimized along with their vision to be most alert when their prey’s vision is worst (while they themselves can see very well).
Nocturnal predators can see while their prey cannot
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Sleepiness is the result of two bio-oscillations overlapping
In diurnal animals, these two processes overlap at night. In nocturnal animals it is the opposite - they are most alert at night (Nocturnal predators can see while their prey cannot)