Anyone have real experience with cats (maybe even dogs) as pets?

My baby tends to get sicky in the morning as I'm sleeping. He throws up liquid, because his dinner already digested from the previous night, I suppose.

Why does he throw up in the mornings? I'm glad he's not throwing up all day, of course. I'm wondering is there something I could be doing to prevent it? Is he not getting his breakfast early enough? I'm just trying to understand why it's in the morning.