The paris feel nervous system is made up of the brain and spinal cord true or false

This is true.

The nervous system is made up of the brain and the spinal cord 

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