The Logic of Porcology

Here's the deal, I'm leaving for a very short Vacation in Kelowna Wednesday night. I am looking forward to seeing my aunt, uncle and all my cousins, and I'm also looking forward to sleeping as much as humanly possible. I have a sinus plug-up and I can't breathe when I'm asleep. This means that I will sleep for 9 hours or so and not feel like I got any sleep at all. On Saturday last I didn't wake up until 4 pm (of course I had been plastered the night before).

Can someone tell me what the best medicine is for clearing your sinuses? And just so we're clear, illegal drugs are not an option.