Thank you again for you replies, RAH, as well as azazel1024's. Let me recap.
Yesterday around 19.00 PM my Nook arrived and at about 19.30 I put it to charge from an USB at my laptop. At around 11, one hour before midnight, it reached 100%. During the charge I browsed it and played with it so when it finally got 100%, I started reading and I read about an hour or more. When I put it to sleep, it was at 95%. This morning it was still 95%. I played with it a little and manually installed 1.1.2 because it didn't seem to install by itself. After I was done, it dropped to 93% and I put it to sleep. Now, at 17.28 it's still 93%. So 7% dropped since last night.
So, a little bit different compared to your version.
Thankfully, I understood the "page numbers" issue. Thank you for the explanation.