Sometimes when I lay down on my back with my head propped up or at an angle my heart beats irregular for a few seconds or skips a beat. It almost always when I lay this way. I'm a 31 year old male, 5'10" 145 lbs. I do have high blood pressure for which I take lisinopril. I have also been told I have a slight murmur. It usually only lasts a few seconds but sometimes will come and go until I change positions. Anyone have an idea if I should be worried?