One time when I really wish I'd had sleep mode turned on is when I left the screen on while on the settings menu which shows the date and time. This means that every minute the screen updates to reflect the new time. I picked up my reader the next day and the battery was dead and gone, and I was at home without my charger. I had to charge from USB which was a pain, the device cycled through several reboots before there was enough power to get all the way through and connect to the computer and I couldn't read it while it was charging.
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