You will be performing a procedure when you anticipate contamination of the arms. should you wear an apron or an isolation gown

An isolation gown so your arms are protected. An apron cannot protect your arms. 

Yes you do , which is cool

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