I don't understand the logic behind this line of reasoning for predators sleeping a lot. Predators hunt to obtain food which provides them with calories. More

I don't understand the logic behind this line of reasoning for predators sleeping a lot. Predators hunt to obtain food which provides them with calories. More calories must be gained than spent from hunting, otherwise it would be pointless as they would make a net loss and, ultimately, starve. It is more likely that they hunt less, and sleep more, because hunting has large payoffs, and therefore they don't need to continue hunting for a while.