Who said you have to sacrifice your physical health? Keep careful track of how many "mini-breaks" you take during any one session of "solid" work, and I think you'll see that we spend less time actually working, be it physically or mentally, than we actually think we do.<p>A lot of it really just boils down to basic personal discipline - a field I'm personally lacking at, but is certainly something that should first be considered before resigning oneself to an unhealthy spiral of midnight crams, cheap MSG takeout and a constant stream of coffee.