Taking time off work is probably just as important as the work itself. Being able to step away, take a break, and come back with a new perspective will likely benefit your work—besides, you've earned it. Although, of course, what you'll often find happens is that the freedom and relaxation your vacation offers you makes returning to work even more difficult than it already is on a normal Monday. Being denied the chance to take leave can mean missing out on a once-in-a-lifetime opportunity, fami…