Seriously, just go home when you've had enough. You've stated your plan, so stick to it. If someone gets huffy it's their problem. In the grand scheme where you sleep isn't going to matter to anyone but you. I hate stupid games as well and I'd want to go home too.
Your sleeping plan will be forgotten by them quickly as this is not about you, it's about the wedding. They will be so excited about it, that your preference to go home won't be a topic.