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Sleep tracking has changed in the past 2 weeks

Starting about 2 weeks ago, my REM sleep has dropped to almost nothing... like 20 minutes/night, instead of averaging 2+ hours/night. Deep sleep picked it up, as now that's showing like 2-3 hours/night, instead of an average of ~1 hour. Anyone else notice this shift? Tried resetting the device, and even using a different Vivosmart 4;same results.