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I've always thought the battery drain was so minimal during sleep mode as to not be a concern and never really need to turn it off. When this thread was revived again, I did a test on 2 of my Glos more for my own curiosity. Both have the same firmware, 3.15.0, and both have the same identical books on them, both had light at 90% (which shouldn't matter since the light is off, just mentioning it). I charged both to 100%, then turned one completely off and put the other one to sleep only and didn't touch either one for a week.
And when I just checked after the week was up, they both are still at 100% battery. Both of these readers are over a year old, one probably used more than the other is the only difference.
My other older readers that I never use I of course shut off and don't bother leaving in sleep mode. And of course the batteries need recharging after maybe a month or so anyway even when turned off. I never paid attention to how often, I just want to keep the batteries from dying.
But unless you're storing your device long-term, I still would recommend just leaving it in sleep mode.
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