1. the key to the success of following any diet plan is to
tams
o a. limit all forms of sugar in the diet.
o b. follow only the dash diet.
o c. keep the diet healthy and balanced.
o d. restrict as many calories as possible.

C keep the diet health and balanced

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