Just went to the Dr last week for the same thing. I am male, 33. I am also a paramedic. So I know a "few" things about the heart. You should get it checked out. It could be what I have, Atrial Fibrilation. Or A-fib for short.Which is the top part of your heart miss firing. Could be absolutly nothing. But most serious, a blood clot. Untreated. you could try if it were a clot and you throw one, and it gets into your brain. Or a possible
stroke. It is up to you, but with modern medicine. You should be fine. I was in and out in 3 days. They will check you out, maybe give you some drugs, do some test looking for a clot, then
shock your heart ONLY if needed. (called
Cardioversion) and you can go about a happy life again. If most serious, they put a camera down youre throat, look for clots, then if none, shock the part of your heart that is causing the problem, and all is good and never have the problem again. I also am like you, ONLY notice the heart acting weird when I am at rest, or sleeping. Sounds too familiar. Good luck and let me know how things work out for you.