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Sleep Tracking Tracks Sleep But Changes Values During the Next Day

I repeatedly have incorrect values showing when I sync my VA3 after waking up. Sometimes, the start time is incorrect. More often, there are significant amounts of time during the night when it shows that I have been awake when I have been asleep. What is equally puzzling is that during the day, it will often change its interpretation of my sleep. Often, it changes the start time so that it is more closely equal to the actual start time. It also often changes the time it initially indicated I was awake during the night to time when I was asleep. Has anyone else experienced this? What is going on? This is totally different from my VA HR which almost always got the information correct and never changed it during the day.