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With the Fitbit Flex, you have to tap it 5 times to enter sleep mode and then 5 times in the morning to take it out. This helps it to track how long you slept for.

To work out how many times you wake up and how well you've slept, the accelerometer tries to detect any major movements during the night. Tossing and turning implies a poorer quality sleep.

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Q: How does fitbit detect sleep?
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