No it isn't as you can't overcharge, the charging is regulated... read the other threads on battery usage and/or do a google for manufacturer specifications concerning Lithium-ion/polymer batteries... best way to charge is use a separate PSU and plug it in before bed and unplug the next morning.
If you could manage to overcharge your eReader then it could damage the battery or worse but they stop charging before an overcharge takes place...
Quote:
Originally Posted by SeaBookGuy
Is it really dangerous to "overcharge" the battery? Sometimes, I've found it most convenient to charge when I go to sleep, and unplug the device in the morning.
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