What is the difference between shutting down the device entirely and just putting it on hold and letting it "fall asleep"?
I kind of like putting it on hold and then a screen saver shows up and soon enough it blanks the screen. When I come back I'll quickly get back to the book at the same page/layout/zoom etc as when I stopped reading the last time.
Do I save much battery time by shutting it down completely when putting it away? Why would it need battery while in "sleep" mode and hold enabled? It doesn't have to check for user input, it doesn't need to show anything and it could store the "current state" to a memory chip which doesn't need active power to last.