Just fully charged computer one night did not turn off, there is no electricity, then this is a normal thing, because your laptop battery in the electricity, simply not enough to support until dawn, a night time but ten hours, laptop even if you are full of electricity, then you are out of the electricity, alone with the battery, can only use about four hours.
There is something wrong with the battery. I suggest you charge it again, then turn it off and leave it overnight to see if the same thing happens. If there are any, then change the machine quickly, since it is brand new.
I think the computer just went to sleep. It didn't shut down. If it is turned off, it may be normal, and it can be plugged in and put on. My win10 system, after manual shutdown will not significantly consume less than 1% of the appearance of a night (did not pay much attention to)