Take 'er easy, man. Let your mind rove. Some of the world's best ideas occur to restless people who must stay quiet for a time, for their health. Write down the notions that occur to you, the squirrelly ones and the unlikely ones, and the ones that are just funny, or maybe not so much. I bet it was someone who couldn't travel for a while who came up with the long-overdue idea of putting wheels on luggage. What took so long with that one?