its 153 am,im bored,looking on here,and i just had about 6 in a row same thing you are describing,,,only thing is ive been drinking sweet tea half the night..lol....ususaly some outer stimulent makes this happen,,,,relax,and rest assure,youll be here tomorrow.
This happens to me everyday several times a day. And my heart seems to just be chugging along like normal and then I have those really hard beats. Not aware of any pauses or anything like a PVC. Got me...doesn't seem to do any harm, as long as it doesn't take off and go crazy, not going to worry.
I have read many posts on the subject you bring up, so I hope you'll get some metrics from people with experience. Of course, the terms are very general. Some numbers like HR might be helpful in calibrating a response.