Information security is .

a challenge for medical institutions because of the number of people who need rapid access to it
not required by law
accomplished by tightly limiting access to electronic information
a factor that does not get much attention in the law

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