Does the air bubble in the back of your throat make it feel likes its hard to breathe? I once had this problem and I went to the doctor and they gave me a shot and said I had to get it because my throat could have closed up when i was sleeping! I don't have asthma or anything like that so it was really strange.
Do you have tonsils?
It could be post nasal drip that is causing the "roughness" that feels like dust in your throat.
If your tonsils are swollen, depending on size, it could block your breathing.
There are a lot of ifs here, but you didn't really give much to go on....
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