Why do people give in to negative peer pressure?

ANSWER:

People give in to negative peer pressure because they have a low self-esteem and low confidence level.

EXPLANATION:

People who lack the required support and confidence give into negative peer pressure.  Peer pressure is the pressure that comes from people in whose company one stays in for most of the time. Peer pressure can be positive or negative. Negative peer pressure further lowers the self-esteem and confidence of a person because he or she is always nudged by the peers for the negative traits.

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