Hi, I am a 23 year old male, I am a VERY active, and fit person, I work-out 6 times a week, not much cardio manily just lifting weights, I get my cardio from other sources. Anyway my question is I started having a weird "flutter" in my chest a while back. Basically what happens is when I'm right about to fall asleep or my body is starting to wind down I feel my heart beat once very quickly and a little more powerful than usual, once it does it my heart rate goes right back to normal, I never experience any pain, but I do kind of cough after it does it. This used to happen when I was younger but it would happen randomly maybe once a month but it wasn't when I was about to fall asleep. I have always played full-contact sports, and never had an issue with shortness of breath, rapid beating heart, and have always had near perfect physicals. I'm just concerned and have no idea if it's normal and something I shouldn't be terribly concerned with. When ever I got to the doctor I have never had a heart issue... any kind of information would be wonderful...