i've come to the conclusion that i actually end up more tired at the end of a day when i've done almost nothing physical as opposed to the day when i work hard physically...i spent most of the day at my desk doing paper work....well of course none of it is on paper anymore.....just a artful arrangement of 0's and 1's on a screen but i still think of it as paper work....several problems to solve and the seemed to come in flocks....not one at a time but i big bunches....also had a load that had a problem and had to go back in to take care of it.....long day and i've had it....