Are you on any blood pressure meds? Post nasal drip? Smoke? Work history? Allergies?
Lots of variables can cause chronic cough. I have to be careful with my blood pressure meds as certain ones give me a chronic cough. I, also, have severe allergies, post nasal drip, am around 2nd hand smoke, have asthma, etc.
I have not heard of sleep apnea causing a chronic cough, but think it would be possible that throat irritants that inflame the throat tissue and make it swell would impact sleep apnea due to that swelling. In other words the throat inflamation would worsen the sleep apnea -- but the sleep apnea was not caused by the chough.
Ask your doctor about using an inhaler for the cough. I've had chronic coughs in the past and have been prescribed inhalers after a few weeks when they didn't go away. They worked really well.
YESS!!! I was lucky enough to find out that my chronic cough had absolutely nothing to do with my respiratory system.
I was going in for a pre-surgery EKG, and the nurse administering the test recognized my cough as being symptomatic of GERD...Gastro-Intestinal Reflux Disease. My stomach acids were irritating my esophagus, causing the coughing.
She had worked in a GI's office, and she said there was a 'certain sound' that seperated this particular 'type' of cough from others.. I had no 'heartburn' or other stomach symptoms.
Once I started on some GERD meds, the cough went away! I'm on daily Prilosec now, but was on some other meds before (sorry, don't remember the names). GERD is most apparent while lying down, so most noticeable while 'trying' to sleep!
This may not be your problem, but it's worth checking into.
Brilliant minds think alike. But MaggieJay beat me to the punch. Silent reflux was my first thought once sinus drip had been ruled out.