It’s hard to explain to a non WUKAR person. Plain and simple, I am more tired at work on the days I don’t train (which is only one day a week).  You would expect a 10 mile tempo run at 7 min pace before work would make my day a bit harder than a sleep in day but it isn’t.  I can explain it easily although I have exactly 0% scientific proof behind my reasoning.  It takes me  3 to 4 hours of awake time to get my body and mind rolling.  Starting my workout at 5 am and going hard until 6:45 gets my blood flowing and my body ready to tackle the day.  Without it, I drag.  This only holds if I get the right amount of sleep and the length of my day depends on that amount.  8 hours gets me through the entire day. 7 hours and I bonk at 8 pm. 6 hours and I pass out on the couch at 7 or whenever  I get home from work.  The last ingredient in the equation is food and quality thereof.  If I keep the quality calories coming and keep drinking, the days go well.  If I find myself having an orgy with the sugars and candy bars, I have a great morning and early afternoon with an early sunset.  Sleep ins are necessary I realize, but the day is going to be long and slow.  The guilt of not running is not the issue as I am smart enough to know that I don’t have to hit it hard every day to be in great shape.  With the addition of biking and swimming into my daily routines, I don’t even run as many miles as a used to.  It is merely metabolism, mine is dictated through exercise.   So long story short,  if I take the Kick A$$ out of the WUKAR it will only be wake up, repeat and that just makes me tired.