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Spike in heart rate during sleep

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Hi my heart rate during sleep averages between 63-65 beats per night. I've looked at my fitbit readings this morning and saw a worrying spike at 4.50am, my heart rate went to 197 beats for less than 5 minutes then went back to normal. I've had my Fitbit for 3 months and this has never happened. Could this be a glitch? My Fitbit has been pretty accurate up to now with everything else. My Fitbit says I also woke up during this time but dont recall feeling uncomfortable or that my heart was racing. 

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That is worrisome, @Fitness87 . I can’t say if this is a glitch but it would not be a bad idea to mention this to your doctor. 

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