Describe two barrie's that prevent some young people from making healthful decisions?

One would be peer pressure, and the other would be curiousity, seeing what's it's all about by experimenting so it may the them in the wrong direction.

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