I've just purchase a Fitbit sense. My heart rate is been picked up OK but my sleep isn't. At first a time of less than 3 hours was picked up and this time period has reduced in the 10 days I have been wearing the watch, the last 3 days nothing has been registered at all. The same with the skin temperature and now the Sp02. What is going on? Why is my Fitbit not functioning correctly?
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