As one who, reading late into the night, 
When overcome by sleep, turns off the light 
And yields whatever he can sense by sight 
  
To what the gates of ivory or of horn 
Will send him, sightless as a child unborn, 
To goad, amuse, remind, reveal or warn, 
  
So may I turn a light off and embrace 
With resignation, better still with grace, 
The dreamless sleep that all awake must face.
David Berman
http://www.poemhunter.com/poem/grace-37/