Maybe instead of thinking of sleep as a crutch, think of it as an optimization enabled by periods of decreased predator effectiveness? Think about how real-tim

Maybe instead of thinking of sleep as a crutch, think of it as an optimization enabled by periods of decreased predator effectiveness? Think about how real-time guarantees on GC are bad for throughput. Evolution can get "stuck" when optomizations become obligatory. One theory of "hot bloodedness" (which is not one thing, nor something that evolved once, to be clear) is large species that passively maintained some body temperature then shrinking and being forced to actively maintain it.