All of the following are considered nondangerous body fluids except: a. saliva b. sweat c. blood d. vomit

D would be the answer to your question

I’m pretty sure the answer would be D

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

You didn't give the options btw