I visited my wife's classroom yesterday to help out a bit and teach an art lesson. (I do that a lot; it's muy mucho fun.)
Before the art lesson started and suffering from severe sleepy-ness (due to a late night's work) I curled up on the floor underneath a table in the back of the classroom and took a short power nap. 20 minutes tops.
The 6th-graders thought this was pretty amusing and they made me a special little card to let me know. When I woke up I found this.