Why Am I Sooooo Tired?

It happened sometime this afternoon, after 3:30 PM.  I do not know what happened but all of a sudden, my body just became so heavy with tired.  I came home from work, and tended to the various chores and errands I had planned and do routinely, but with multiple breaks.  I usually can get a second wind, but I can not find it tonight.   I am just feeling more and more heavily tired.

This is the last of my computering tonight.  I am going to get on the recliner sofa and lay back...