Must...finish...puzzle

After dinner Malcolm announced it was a puzzle night and picked out his "city puzzle" - 500 pieces including a lot of similarly colored sky and wet pavement. We reminded him that this is usually a two- or three-day puzzle and agreed to get started. Two-and-a-half hours later (without pausing even for a snack or potty stop) Malcolm fell asleep on the floor with his hand on one of the last few pieces, then woke up with a start and scrambled to finish it up.