Yoga Class that Teaches how to Sleep in Cramped Quarters

Can you tell I was on a plane recently?  It would be great if there was a yoga class that could teach you how to position your body so you could sleep comfortably on a really cramped plane.  The positions could be called "Between two fat warriors" and "Broken neck crane".  I was looking through the sky mall magazine and really considered buying one of those ridiculous inflatable tray table pillows even though I only fly once a year and in the middle of the day.