What characteristic relates to having the necessary skills and knowledge for the job?

Some characteristics would include having good communication skills. Interacting with others is a very important aspect when it comes to business and dealing with customers. Another characteristic would be self management. Remaining mentally control helps improve your health while working and keeps you on track without messing up.

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