I take back not being able to sleep comfortably in a subway train. This guy seems to have it figured out. It looks like being back in the womb. It's medically proven that being in a womb-like position can be extremely comforting. The only thing this guy really has to worry about is his knot-tying abilities. That's a horrible way to wake up, and it definitely won't garner any sympathy from the other riders.
I wonder if this is a product that someone sells. I think it's pretty amazing that someone can come up with an idea based on the needs of the people and then make that thing. If the idea takes off then the creator becomes a millionaire and suddenly we'll see hundreds of these things hanging in all the subway trains across America.