Occasionally, while sleeping, Ill raise my arms above my head.  Then Ill wake up because my heart will feel like its fluttering.  Last night, I    only felt the sensation in my left arm--not both like usual.  Do I have a problem and should I see a cardiologist?
Hello.... You did not give the details of symptoms. Generally palpitation and radiation to left arm is more related to heart. But if these symptoms only occur when you sleep with raising hand then it is very unlikely to heart pathology. So my advice is if these symptoms are associated with sweating and diaphoresis and precipitating factors are other than that also then you should consult a cardiologist. Otherrwise you may try to take some muscle relaxant like Diclofenac with chlozoxazone. Thank you