Why can't we be nocturnal?

I personally love night and hate morning.

So why is it drilled when you are a kid that it is unacceptable to stay up during the night time and sleep during the day?

What if everyone were awake at night and slept during the day?

I think people would have more cat pets.

That's not a bad thing.

I love cats.

Go cats!

I'm becoming nocturnal for cats.

And fandoms.

But also cats.