i get a genuine rush from thinking about all the things that can go wrong with the plane. while in on the plane that is, not right now.
pop some vallys before going on the plane, you'd be so relaxed that falling asleep would be the easiest thing to do
.
personally apart from the fact i love flying and get too excited i could never sleep in public while sober, the thought of waking up with a massive stiffy while 2 strangers are trying everything not to look to the left (again) keeps me wide awake.