Which principle descending motor pathway provides conscious control over voluntary muscle movements?

I think the correct answer is the Corticospinal pathway. It is a white matter motor pathway starting at the cortex that terminates on motor neurons in the spinal cord, controlling movements of the limbs and trunk. There are more than 1 million neurons in the corticospinal tract, and they become myelinated usually in the first two years of life.

Ithink its part b hope that

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