The illustrated encyclopedia of sleeping positions on a plane
24 documented poses, including the Human Triangle, the Thinker and, for window-seat passengers, the View Finder (pro: partial head support; con: possibility of drooling down window).
If you are being paywalled, I've uploaded screenshots here: https://imgur.com/a/JRDdBl4
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A lot of these will cause an attendant to tap you on the shoulder and ask you to sit properly.