So uh, I don't really care about the polyphasic stuff. Would this device improve normal sleep? I struggle to find comfortable sleep masks. I suppose it's kind of expensive, although the sleep monitoring stuff is cool.
Check out the "Mindfold" for a no-gimmick sleeping mask: http://www.mindfold.com/. It's really comfortable to wear and 100% pitch black dark. I actually found it via HN some time ago and I like it a lot.