the typical question:
No, it is not normal. To find out the reason I need more info:I get battery drain when the device is supposed to be sleeping (that means when I simple swipe the power button once and the random cover is shown and also the frontlight is automatically turned off). I go to bed and the day after battery drained around 10%. Is it normal?
1. Install the latest build
2. Charge your battery to 100%
3. Go to Launcher/Settings and set Log level = Debug
4. Open Cool Reader
5. Leave you reader to the night (6-8 hours) sleeping in Cool Reader
6. Give me the vlasovsoft/launcher.log.txt in the morning (get only for today and yesterday). You can post it here.