“Predator” vs “extremely intelligant” is a wierd dicotomy to make. Many mammallian predators are extremely intelligant, such as most canids, large bears, and felids.

On the other hand, sleeping is an energy conservation strategy for many niches. Obligate carnivores tend to sleep a lot, because its the best thing to conserve energy if you aren’t activel hunting, ane the caloric payoff to a successful hunt is high enough that you don’t need to spend all your time doing it.

Many leaf-eating mammals also spend a lot of time sleeping, and have even evolved extreme energy conservation measures, such as sloths having a unique muscle fiber arrangement and reversed wrist tendons

Most animals are just trying to conserve enough energy until their next meal since they haven’t invented grocery stores yet. If that means they sleep between meals than that’s what happens. Predators get that luxury. Prey animals sleeping all day is probably a bad idea.

Humans are also an outlier when it comes to energy conservation. Our bodies are ridiculously efficient but at the expense of not being very strong or fast. Endurance hunting is a thing humans can do. Instead of running faster than our prey we run longer than they can.

I think carnivores only get to eat if they hunt something and tend to evolve in a way where moving around consumes a lot of energy since they need to be big/fast/etc

Dogs are omnivorous and so are we

It’s not about intelligence, but about environmental pressures. I’d also argue that cats are more intelligent than many humans.