Always loved that Aphex Twin track they used on the video promo.
Whoa, it changed a man in pajama pants going to sleep into a woman most decidedly not wearing pants upon awaking. Tech wizardry!
Usefulness aside, that's a damn beautiful product.
If it works as well as they say, it may be worth an investment. I'll probably hold out for the first round of reviews, using Sleep Cycle until then.
These sorts of things going into Health on iOS 8 could be really interesting!
Up by Jawbone does this for me. It's simply a wrist band, but it connects to my iphone via bluetooth, tracks my moves and sleep. It' works pretty good, although the alarm(the band vibrates) does not really wake me up unless I got enough sleep.