Which effect does staying active have on an older adult ?

As we get older out hearts get slower so It is good to stay active because it keeps your heart rate going and pumping blood throughout out the blood vessels.

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Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle