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This is not to say that devices tend to be unreliable and that manufacturers have rushed to defend their products. Dr. Conor Heneghan of Fitbit claimed that few users are facing severe sleep anxiety and that follow-up data could highlight the effects of consistent sleep patterns and harmful habits. . They can also locate heart rates and movements badociated with different phases of sleep.
However, they are still not as accurate as people – Fitbit's own study showed that matches between its trackers and medical equipment only accounted for 70% of the time, compared to 90% for humans. And without regulations or standards, the results obtained may vary from one device to another. Even though the data may still be useful, you can take it with a grain of salt or even completely avoid sleep tracking.
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