There are lots of fitness trackers, smartphones, and smartwatches on the market, all of which / some of which include sensors to track movement., all of which, some of which, Bob Troia wants to know how long and how deeply he sleeps / why he sleeps so deeply each night., how deeply he sleeps, why he sleeps so deeply, Self-quantifiers are people who make money from / spend a lot of time and money on finding out how their bodies function., make money from, spend a lot of time and money on, Technology journalist David Pogue believes / doubts that fitness trackers and similar devices can motivate users., believes, doubts

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