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:max_bytes(150000):strip_icc()/GettyImages-609824874-5bf4b1c146e0fb002694d646.jpg "How Does Fitbit Track Sleep? Understanding the Sleep Stages Feature")
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Why Fitbit's biggest advantage over Apple Watch Series 4 is sleep tracking, not fitness | Macworld
How accurate is Fitbit sleep data? - Nick Pullano's blog, CEO of PetDoors.com, sharer of memories and life hacks.
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The Sad Truth About Sleep-Tracking Devices and Apps - The New York Times
