Which of the following describes the world health organization (who)

I do not know your choices, but I hope this helps. 
The World Health Organization (WHO) is a department of the United Nations. Their offices are in more than 150 countries. They work with Governments to help people get the best healthcare available. They also are trying to cure infectious disease. They are responsible for eliminating Smallpox in 1979.

Can you translate this

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