Rapid heart beat

I am 56 years old and for the first time wake up on a weekly basis with my heart pounding so hard I think I will wake up my partner. I do not have any recollection of nightmares that can be causing this occurance. The only other thing that is new is that the other day my legs gave way from under me. It was a strange feeling and only lasted a few seconds but I caught a chair before I fell. My question is - are these conditions normal and part of growing older? Or should I be worried.


This discussion is related to night tachycardia.