Suggest Treatment For Excessive Salivation While Sleeping

Hello, I m a teenager right now, 16 going on 17 and I often find I have problems when I go to sleep. I often wake up at 4 or 5 in the morning with so much saliva in my mouth that it s uncomfortable and I have to keep my trash can near by to keep spitting it out until I finally fall back asleep. This usually is how I handle it, but as of late I will be spending time at a friends for a week, and I don t want to deal with the discomfort of it, is there any way to have less saliva after sleeping? I also get the same discomfort once I first wake up and have to do similar things to feel better, and sometimes if that doesn t work I ll use Listerine really quickly to at least make it taste better. Is there any way to fix this problem, or at least make it less noticeable? I brush and floss regularly.