a happy birthday by ted kooser

This evening, I sat by an open window
and read till the light was gone and the book
was no more than a part of the darkness. 
I could easily have switched on a lamp, 
but I wanted to ride this day down into night,
to sit alone and smooth the unreadable page 
with the pale gray ghost of my hand.

where I come from we call this brooding hour. he captures it perfectly