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Deep sleep time changes each time I look and is not reliable

When I woke up this morning, Garmin said I had 44 minutes of deep sleep broken into 3 separate stages during the night. The second time I looked a few minutes later, the third round of deep sleap was removed and it reduced the deep sleep time to 36 minutes. Now, it shows only one round of deep sleep for 28 minutes. Why is it removing my deep sleep data?

0 trux over 4 years ago

Yes, that is a known issue. Look for example here:

Sleep tracking
Sleep Venu

0 8775859 over 3 years ago

I am having the exact same issue. Every time the app synchronices then the deep sleep reduces. After a few hours the deep sleep is all gone. Me and my wife both have a Garmin Venu Sq. I have this issue for the last three days. My wife does not have this issue.