We literally just learned in health class that guys get tired after they do that because of some chemical in their brain. So, technically, it’s not totally his fault that he passes out. But I get why you feel ignored. It would be super annoying to be laying there awake while the other person is just snoring away like nothing happened.
You just need to tell him before it happens next time. Say something like, “Hey, don’t fall asleep right away, I want to cuddle.” Guys are pretty clueless most of the time, so he probably thinks everything is fine and you’re just resting too. If you tell him what you need, he’ll probably be happy to stay awake a little longer to hang out with you.
If he still just rolls over and snores after you ask him not to, then he’s being kind of selfish. A relationship is about making sure both people feel loved, not just getting what you want and passing out. Give him a chance to fix it, but if he doesn’t care about your feelings, maybe he’s not the right guy for you.