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Bradycardia and Sleep Stages

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I use my Alta HR to keep track of my non-symptomatic Bradycardia. I've noticed that on nights when my heart rate drops below 40 I don't get sleep stages. HR in the mid 30s is not unusual for me during sleep. Am I correct in thinking that a heart rate this low is considered to be in error and causes the sleep stages feature to fail? 

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I might be having this problem as well. Haven’t gotten sleep stages for two weeks.

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