I put a piece of paper under my pillow, and when I could not sleep I wrote in the dark. Henry David Thoreau
I'm one of those people who is actually inspired by a deadline. I might not sleep for many days on end, it may not be good for my health, but it definitely helps. Carter Burwell
Quiet night that brings Rest to the labourer, is the outlaw's day, In which he rises early to do wrong, And when his work is ended, dares not sleep. Philip Massinger
The devil does not sleep. Hungarian Proverb
An enemy does not sleep. French Proverb
He who has cattle on the hill will not sleep easy. Irish Proverb