Originally Posted by DixieGal
Silly suggestion, I'm sure, but you didn't leave the light on or anything?
I don't think so. The first time the drained happened, I made sure that when I went to sleep I put the device to sleep.
It could be what someone else suggested: before I crawled into bed, I had downloaded a bunch of PDF articles from my computer to the SD card and then put it into the reader. I did this via Calibre which as I understand does not initiate indexing in the reader. So perhaps all the time I was reading my book the reader was also indexing the PDF?
Anyhow, the second time around the problem seemed to have disappeared.