3.the morning after a night of heavy drinking a person is likely to experience a headache and extreme thirst. these are symptoms of a. intoxication b. a hangover c. depression d. a stroke

Anxiety, stress, or something like 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

Health maintenance organization