i am looking for theories from professionals or student of medicine or people who went through the same thing and have ID'ed it and or found some natural cure that works::: i went to my gf's in nc she has a new cat id wake up in the middle of the night and it would be hard to breathe. then i'd cough up clear mucus (not an infection yellow mucus would indicate that) until my breaths were normal, standing up helps, but it doesn't occur like an allergy, it occurs when i lie down flat on my back its not the cat cause i've been back home and don't own one i don't really get allergies it's as if the cat has triggered it cause it never happened too much b4 bendryl did help. I am highly confused because what allergy gets triggered by lying down?? someone please help figure this out i dont want to take anti histamines every time i lay on my back. what would cause mucus to build up its as if it fills the bottom of my lung then when i lay back it clogs my airways? thanks for your theories