The dri that is most commonly used to determine the nutritional value of individual diets are the:

DRI refers to the Daily Recommended Intake, or the number of kilo-calories that a person should consume on a daily basis. These calories should contain a balanced amount of the necessary macronutrients and micronutrients that the body needs to power and sustain the energy it needs on a regular basis. 

The DRI for males and females vary. Males require an ideal DRI of 2,500 kilo-calories while females require an ideal DRI of 2,000 kilo-calories. DRI is not fixed in that said number and may still vary on the person's age, metabolism, level of activities, among others. 

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