For many air travelers, the thought of trying to sleep on an airplane is a laugh. There's always the background chatter of your fellow passengers and crew, the noise of the aircraft itself, and of course the fear of falling asleep and drooling on the shoulder of the complete stranger next to you. Airsleep (free, with in-app purchase) is designed to help you relax a bit and hopefully be able to reach a deep sleep while you're flying.
The way Airsleep hopes to provide you with some sweet dreams while on that 14-hour flight to Singapore is to feed you a mix of natural sounds (like rainfall, ocean waves, or desert wind), ambient music by the founder of Combustible Edison, and "brainwave audio" -- whatever that is. Apparently the Airsleep folks have a patented process that does something to "tune your brain to its deep sleep response" through slow-wave audio.
Whatever it is, there's a long disclaimer that you have to agree to before you can use the app saying that it's for "entertainment purposes only," and that a long list of people who shouldn't use the app (see image in gallery below). Frankly, the disclaimers and instructions are about the most sleep-inducing thing about this app.