How does a Fitness Tracker know you are sleeping?

AmongTech: When you set your Jawbone UP or Fitbit to its sleep mode, both devices will use their accelerometers to track your movements, including the speed and direction you’re moving. This is the main way they track your activity during the day and also how they tell when you’re sleeping. But how does it know you are sleeping? What does it measure?

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TechImperia2784d ago (Edited 2784d ago )

These Fitness Trackers cannot provide a deep analysis of our sleeping patterns since they relies only on movement alone, agreed that they cannot be termed as accurate just yet. however they give their users a general idea about their sleeping patterns.