I was just wondering why does mucus get xtra thick while ur sleeping? Every morning I wake up feel really crappy for about 30 minutes. The first 10 minutes I spend coughing crap, and I have noticed stuff is thicker, stickyer, and nastyer in the morning, however most of it is not in my lungs, it is in my throat. What is it about sleep that causes this, because if I sleep 2 hours I get a little bit of this, and if I sleep 12 hours its really bad. I used to like sleeping 10 hours a night, but no I try to aim for 7 because if I sleep any longer then that my mucus builds up alot and annoys me in the morning or sometimes even wakes me up.