How does a nonprofit food service operation differ a for-profit operation?

A non-profit food organization means it doesn't gain money for it's own personal use, while a profit food organization means its gaining money that they can use and keep for themselves.

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