Yes, use sleep with no poweroff. Even in that mode, it will last weeks before the battery runs out if the autosync is turned off. And getting back to reading will only take an instant.
Of course, I still seem to open the cover as I'm doing something else and then forget about the reader until out of the corner of my eye, I see the screen flash as it goes to sleep. And yes, I'll wake it while trying to remember what I was going to do and get distracted again and ...
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