trouble breathing when lying down?

Hi. Iv'e recently noticed something weird when I lie on my back. (I have noticed this at nght when I go to bed, or anytime I lie on my back). After I have been lying down for a couple of minutes, I feel like I am not breathing deeply enough.This only happens when I am lying on my back. I'm not wheezing, and its not like being short of breath like when you exercise etc. When I force myself to take a deep breath, the sensation goes away temporarily (about 5 seconds) but after the next couple of normal breaths the feeling comes back. It's really annoying, and at night I usually just turn over onto one side and go to sleep.This started about 3 weeks ago. Anyone ever heard of this? If so, do you have any idea why it could be happening?

[nodd]

this happens to me too. It's been happening more and more frequently. i have been stressed out the last couple weeks and take medication for an anxiety disorder. but overall i've been pretty good with anxiety. i have been drinking coffee daily but nothing too crazy. i dont drink or use drugs (anymore). but the scary thing is that if i'm laying on my back and about to fall asleep all of the sudden i can't take a breath in and i sort of heave up and gasp for air. it ***** so bad. no idea why. it's like i feel a weight in my chest when i'm lying on my back. idk what's going on but i think i'm going to have to go see my doctor even with my crappy insurance so i can't wait for this bill to find out it's all just nothing and related to my anxiety disorder again. fml. lol