Sixteenth Day of September

Fatigue,
what a miserable word,
I always think of it as effete -
the leisure class needing a siesta after some
low stress and frivolous recreational activity.

Then what do I call this,
this steady state of lethargy
accompanied by a foggy brain
and heavy eye lids following
a night of more than ten hours of sleep?

I don't know its name,
or I dare not speak it.