Darkness makes tired

Graveyard fence, originally uploaded by jiihaa.

For some reason I have felt tired during the last few days. Perhaps it is the darkness which hardly ceases even at noon, thanks to the thick cloud cover which never seems to go away.

Today the nominal length of the day was 6 h 24 min but it seemed much shorter. On the other hand, there are only a couple of weeks until days start to lengthen again.