I'm jumping in more to follow along, as I don't have the answer to your question but am interested in the subject sleep apnea... I suffer from mild obstructive sleep apnea myself. Is yours obstructive or psyco-whatever, don't know the name of the one that is driven by mental signals. That said, I doubt any form of apnea would cause irregular heart beats... it could and likely does cause a high heart rate as your system tries to make up for the lack of oxygen caused by a lack of lung function.
Have you undergone a medical supervised Sleep Study/Test?
New research provides the first hard evidence that the characteristic snorting and gasping of sleep apnea can spur potentially fatal heartbeat abnormalities. The researchers focused on two dangerous heartbeat abnormalities: atrial fibrillation, a disordered fluttering of the two upper chambers of the heart (a major risk factor for stroke); and ventricular tachycardia, a too-fast beating of the lower blood-pumping chambers that can cause sudden death. I can help you with the snoring problems ( Asonor anti snoring solution), but I recommend you to consult a doctor for this. I hope this will help you !!