I swore I was having heart issues at first, but expensive tests ruled that out. My heart would literally be leaping out of my chest and every doctor would tell me that my vitals were NORMAL! Lately Im rather inactive physically after losing my job, so im starting to experience similar symptoms lately. It seemed unusual to me at first, but one of my main triggers is lying down, particularly to sleep and sitting down, particular for longer periods.
I'll experience chest tightness/heaviness, feeling like im not getting enough air, sometimes chest pains, sometimes tingling/numbness in nose/face or hands and without fail every time I feel as though my heart is beating irregularly. I would and still do tend to focus on the beating of my heart while im trying to sleep, resulting in the inability to get to sleep very well.
I kind of think that the heart thing is associated with the heightened alertness/awareness of some sufferers, a large portion of the human population has a heart beat that speeds up when you inhale and slows down when you exhale and some more than others, and the heightened awareness does the rest..literally making you hear your heart beat through your ear on the pillow... Of course you should always get a suspected irregularity checked out. Still if its causing you sleep difficulty, short of perscription drugs if your not already taking certain meds, even if you are and still experience it. What works for me is I take a shower, cold/hot/cold/hot if you want then listen to music.
And of course I feel and hear my heartbeat far more on left ear than my right, so try falling asleep on your right side if your a side sleeper. Anyway not claiming to be an expert because Im new to this myself, just saying what works for me. And I bet when I find myself another job (knock on wood) Ill see my symptoms fade once again, wouldnt want to leave out physical activity either thats obviously very important. Too little activity for too long will worsen my symptoms and make me want to be active less and less, I was in such bad shape once I could barely walk to my mailbox.