The talk test can be used to measure the
A. knowledge of an activity
B. intensity of an activity
C. length of an activity
D. cost of an activity
Please select the best answer from the choices provided.

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

Answerfarmer's market; (b) would be my second choice