Without clinical examination it cannot be said why she is having fast heart rate and wake up from sleep in midnight. This is due to heart disease most probably. This may be a condition called paroxysmal nocturnal dyspnoea which occurs due to heart diseases. So, consult any cardiologist urgently,than visit any consultant physician too for ruling out any other possibilities such as respiratory problem.
Answered2016-06-17 04:12:41
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