Sleep Tracking Technology Reveals Nighttime Data Realities

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Millions use devices like smartwatches and rings to check their sleep. These trackers guess sleep from heart rate and body movement.

The market for sleep trackers is large and growing fast. Experts say people must know what the devices can show.

Doctors often see patients who show their sleep tracker scores. Devices show sleep trends, but one night's data is not important.

One user stopped drinking alcohol after seeing bad sleep data. Another user felt anxious from always checking her sleep scores.

Experts think trackers may soon help find health problems early. Do not feel anxious about the numbers, say many doctors.

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What do sleep trackers use to guess sleep?

They use heart rate and body movement.

What do experts say about sleep tracker data?

Experts say people must know what the devices can show.

What should people not feel about their sleep scores?

People should not feel anxious about the numbers.

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