Same here. I have a new V4. It is recording very low levels of deep sleep and the reading reduces several times each day after syncing. Not sure if I should be concerned at how little deep sleep I am getting or what the real reading is.
Garmin : this has to be addressed! make it clear.
I have been taking screenshot of connect sleep page almost every morning because it will change sleep time later on the day.
here is screenshots of this morning it changes twice!
taken at 6h43, 6h55 and 9h39
yes I was probably awake at 6h15ish when I looked at my cell and that's when I clic on connect app and take my screenshot when I get out of bed at 6h43. So explain to me why the garmin servers (algorithms) decide that I woke at 6h41 since obviously I was awake between 6h09 and 6h15.
Garmin tell us how it work so we xan at last doesn't rely on screenshot to correct the data later on...
thx.
https://support.garmin.com/en-US/?faq=iVQQHzafJ70kRgl2voTd6A
Yes, it can change over the day. It is a feature.