What is it if your heart feels like it skips a beat?

How often does this happen, once a night, once a minute, once every 5 beats? Is the pulse regular or irregular? Any feelings of pain or shortness of breath? A lot of people miss a few beats now and then. These are known as ventricular ectopics and are made worse by caffeine and stress. Maybe you are more aware of them when you are relaxed. They are not generally serious. However there are a whole host of other things it could be as well and it would probably be sensible to get a doctor to listen to your heart and do an ECG recording. I wouildn't lie awake at night worrying about it though.