It's another way to tell someone, out of anger, that you will put them in their grave, or 6 feet under if they screw with you again. It's a less direct way of stating it but still gets the point across.
After someone has double crossed or otherwise angered you: "Bitch, if you weren't somebody's mother, I'd put your ass to sleep!"
by lila Demone April 16, 2012
Get the Put Your Ass to Sleepmug.