Good Evening, the last couple of nights I have been noticing that my heartbeat seems to become irregular when I lay on my left side. This feeling is followed by mild shortness of breath. Both symptoms go away in a couple minutes after I get up or change position. I haven t had this issue before and I am finding it to be disturbing. I am wondering if this is something that should be looked into further. Since this has started I have had difficulty getting a full nights rest and I am often quite tired throughout the day. It would put my mind at ease to have some idea of what I might be dealing with,