In the early days of the one-piece immersion suit, some chap hung his up to air by the window after getting back to his room following night flying.
Next day the batty entered in the morning gloom, to see what looked like a suicide, then let out a yell and dropped the tea tray.... Whereupon the room occupant woke up with a start and sat up in bed to find out what was going on....prompting the batty to take off in terror.
OK, that's the tale I was told; whether or not 'tis true, I have no idea.