Why?

Why do we constanly end up eating dinner after 10:00 at night? D was hungry for pizza tonight so he left for the store a little after 9:00 to get a frozen one. Its 9:45 and he's not home yet. The store is less than a mile from our house. I've told him over and over again that I hate eating dinner this late but it constantly happens. He either says he's not hungry until late or he says he's hungry early on but goes outside and starts working on something and isn't done until late. I think I'm going to start making dinner early and if he's not ready to eat, he can just reheat it when he is. I hate lying in bed with a full stomach. Stupid boys.