Nothing had changed from yesterday and today.  Yesterday I was depressed.  And today I was not.  The only difference I could gather was that last night I got a solid night sleep.  Sometimes the explanation for a depression is that simple:  I was overly fatigued.  And the depression lifts after a good night sleep.  It is that simple.  There is no complicated psychological reason.

The depression was totally physical.  I sometimes forget that.  I always have to look at that first.  It could be that simple.  I am aware I have a tendency to become depressed when I don’t sleep well and enough.  Or overdo it or both.  Every one is different.  I just have to respect my limits.