Garmin Connect Mobile Updated Home Page

Ha, the midnight resert explains. What happens is:

+51-63 = -12. Negative battery is not possible, so the make it 0.

0 +16 = 16.

It’s even more wrong then I originally thought.

Sleep. Yes, something as you describe. But the only difference between laying “awake” for some minutes and going to the toilet are just a few steps.

But as long as we don’t know the calculate the sleep and the nap, we don’t know if it’s right or wrong.

And I just proved that’s wrong anyway.

you have described the problem. Lots of people have to go at least once. Few of them can do that sleepwalking. The watch should have recognised this was just a brief interruption

8164841 said:

But as long as we don’t know the calculate the sleep

Sleep is recorded using a range of data. These include resting heart rate, hrv, moving etc.

If you go to the toilet at night and then go back to sleep, your body goes back to sleep mode. In the morning, however, your watch will have recognized from your movement and sleep phases that your body is active again. Your body was certainly not as inactive as it was at night. The clock ended sleep at 8:30 am.
If the clock has ended sleep, what happened after that is a "nap".
It is quite possible that the data may change during the course of the day due to recalculation in Connect.

Still not working!

8164841 said:

Negative battery is not possible, so the make it 0.

No, the lowest value possible is 5 not 0. 

Please send us screenshots that illustrate your problem. What value did you have at exactly 0 o'clock?

This overall value will of course remain (does not reset at 0h)

What is reset are the values for + and -  (Charged by 0% discharged 0%)

So if you still have 10% battery at 0 o'clock, but are still active, the value is reduced accordingly. Then you may still have 8% at 1 am. Then you go to sleep and recharge. When you get up, you have 50% bb (body battery).

The display is then -2 +42 ( = 50% bb)

Then you are active for the day and the battery discharges to 20% by 0h.

Display 20% bb  = -2+42-30 (value for +=42, value for-= -32)

Initial value 0h 10%, then 2% discharged, then 42% charged, then 30% discharged.

8164841 said:

as long as we don’t know the calculate the sleep and the nap, we don’t know if it’s right or wrong.

https://www.firstbeat.com/wp-content/uploads/2019/11/A-Sleep-Analysis-Method-Based-on-Heart-Rate-Variability-071119.pdf 

Scroll down on the start menu. At the bottom click on start menu config (or whatever it is called in english). That will bring you to the section where you can switch on Last seven days.

I don't even know what "start menu" you are talking about, there is nothing listed as that that I can find, sorry