See a doctor: The heart's is not "copper wire." it's living tissue that changes behavior depending upon hormonal and nervous system factors, among other things. People often feel heartbeats when they lie down because (a) there are no other distractions so you notice it more (when do you start to hear all the noises your house makes?) and (b) hormonal and nervous system alter the hearts electrical properties.
Answered 8/24/2013
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