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The Band decided to stop tracking my sleep at 2:00 am for no discernible reason and claimed that I had slept less than three hours.

One night, however, the tracker failed to notice that I was sleeping. While I'm not sure how accurate the sleep tracking cycles are (especially when compared to semi-professional sleep tracking and heart rate tracking equipment), it usually gives me a broad overview of how many hours of high-quality sleep I got in during a given night. The Band 7 is much better than its predecessor at discerning lying in bed from sleeping, and it notices when you wake up at night. Compared to bands from Fitbit and other manufacturers, Xiaomi's sleep tracking doesn't seem as accurate, but it's definitely getting there. The Smart Band 7 also offers sleep tracking. Plus, heart rate monitoring seems more accurate in controlled indoor settings than when you're out running or biking. The Band gives you a great high-level overview of how you're doing overall - as long as you don't care about getting a perfect reading or a perfectly accurate graph after you're done with your workout. That means it can be with you in almost all circumstances, whether you're at the gym, running, riding a bike, or going for a swim. The Smart Band 7 is one of the smallest and lightest options, making it a great everyday companion that you will mostly not even notice you're wearing. And Apple Watch should also be far out of reach for the Smart Band 7. The Smart Band 7 still can't compete with trackers from Fitbit, though. My heart rate is usually more spot-on during workouts and cycling tours, and sleep tracking got more consistent. However, Xiaomi's manufacturer improves the accuracy with every new model, and during my testing, I can confirm that the Band 7 feels more accurate than its predecessor. That shouldn't be too surprising, considering how affordable the Mi Bands are. Xiaomi's fitness bands have historically not been the most accurate, with Mi Bands way too often displaying much lower values than what a chest strap would give you while working out.