I've been having a strange, raspy feeling in my chest on the first breath after lying down for a long time (on the left side, and also on the back). After sleeping in the same position, the first deep breath when waking up feels like a raspy vibration in my chest, like perhaps my airways have been compressed and they're expanding with a vibrating dull noise. I don't have this symptoms every night, it's intermittent and especially when I sleep deeply and for a long time in the same position (especially on my left side).
I've been having this since about 6-7 months (I think coincided with a nasty chest infection), it was even gone for a couple of months (Oct and Nov) and now it's back again.
The rest of the day I breathe normally in any position, don't have any cough or shortness of breath. I smoked for 8 years and reduced my smoking drastically in the past two years to about 5 cigarettes per week.
What can this be? I'm worried because it's related to my lying on the left side.