What are the three keys to good health throughout the lifetime

Three keys to good health are a balanced diet, frequent exercise, and no smoking. A balanced diet will give you the nutrients you need to stay healthy, frequent exercise will keep your body in shape, and by not smoking, you're preventing yourself from becoming susceptible to certain sicknesses (i.e. lung cancer).

Acourse of medicine

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