Given their size and complexity, biological molecules such as carbohydrates, proteins, lipids, and nucleic acids can also be referred to as select one of the options below as your
a. enlarged molecules
b. macromolecules
c. inorganic molecules

The answer to this is letter b. Macromolecules. Given their size and complexity, biological molecules such as carbohydrates, proteins, lipids, and nucleic acids can also be referred to as macromolecules. They're organic, so letter C is not applicable. Moreover, molecules of these substances are not enlarged. 

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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