The most obvious things are pills and booze and earplugs, but with this being the tech forum where's the fun in that! What do you use to send you off to sleep? When on a cramped Euro flight (BA) or stuck next to a noisy grunter/snorter in Biz, the only thing that can save me is my iPhone. I can listen to a bit of classical music, or maybe watch a film/tv show — but when I have a million thoughts rushing through my head I use my pzizz app. It's the best thing I've bought! The website has all the info: http://pzizz.com/ — and it really does work. Splendidly. No matter where I am I can fall asleep with pzizz. I do also have the energizer app, but for some reason that just makes me feel sleepy too.... Do you have any apps or gadgets?