Who is in class for only 50 minutes and is bored and is done with school

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

You would modify how often you work out in reps and sets and also modify calorie intake