The fact that Jawbone has this information on their users (yes, I know they say it's aggregated and "anonymised" data) is pretty scary to me. In my opinion, this data should only be visible to each user, and no one else. I really doubt Jawbone users are aware that their UP devices are sending data to third-parties... it feels like 21st century shackles.
I'm a Jawbone UP user and I have absolutely no problem with this anonymised data being used like this. It can make not only the product better but could also lead to useful research around sleep and health. If I want out then Jawbone has a handy 'remove all my data' option. People share all sorts of data in all sorts of places (as others have pointed out in this thread), and it is their own responsibility to read the…
While some people may believe/feel this is reasonable, it has rapidly become impractical. Have you read the T&CS for all the services you use? Any idea how many pages of text that comes to? Did you also know that the reading level of most T&Cs requires college-level education (just to comprehend)?
My point is that it is already impractical (& will become more so) to suggest that T&Cs can make people aware of anything.