I've got an overnight flight coming up, me, DH and 6yr old DS. Can anyone who has done this before give me some tips on how their child slept on a plane please? I mean literally, what position they were in?! I just can't imagine how it is going to work (maybe because I find it impossible to sleep on planes myself). Did they sleep sitting up? Or lying across your lap in some way? Any advice/pointers gratefully received!