Which behavior reduces your risk for heart disease? completing low-intensity activities taking your pulse eating five small meals each day exercising nextreset

Exercise reduces risk of heart disease

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