A hemispherical migration might make a difference... though the one I'm currently considering involves moving from Georgia to New Hampshire... kinda counter intuitive to your logic...
But, you may be on to something by saying it might be seasonal/weather/climate/daylight related.
Yea, don't they call it SAD...Seasonal Affective Disorder, mood changes, feeling funky, over-sleeping, over-eating, etc...seems to be well identified, looks like I got my piece of the SAD pie as well....
Maybe now is not the time to be using a straight razor?