I had been a user of "jawbone", recently upgraded (or downgraded) to Fitbit family, I have a Alta HR and my friends have Flex2..I cannot see my sleep data - broken into deep sleep, light sleep and REM sleep..and Alta HR was sold and advertised to be capable of this..secondly I cannot see my friends data at all, just his name and picture - no daily activities or sleep data..yes we both have checked the privacy settings and it's all set to "friends"..why can't you develop an app like jawbone!!
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The sleep stages feature is coming soon via a firmware upgrade.