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When it comes to identifying the difference between light sleep and deep sleep, research has shown that fitness trackers are not accurate

When it comes to identifying the difference between light sleep and deep sleep, research has shown that fitness trackers are not accurate

When it comes to identifying the difference between light sleep and deep sleep, research has shown that fitness trackers are not accurate. Rather than relying on your device to measure how well you sleep, consider basing your assessment of sleep quality on how you feel when you wake up. (Dreamstime/TNS)