Currently, the latest sleep period overwrites previous ones, meaning it could say I've only had three hours when I had seven hours before that. I don't like manually editing to just catch all of it because it's not accurate. The rich data is still saved for multiple sleep periods, so why can't they be listed as such, e.g. going back to sleep after being awake for a couple of hours in the morning, or sleeping at night plus a nap in the day. Even if it's not shown on the watch but the periods can be combined in the app to increase accuracy would be great, because the app currently records the time in between the sleep periods (say, I've been awake but in bed) as light sleep when it's wakefulness, and recording that inbetween time affects my sleep score and balance of all the stages.
I use a Venu 2S.