How are you charging your nook? I've noticed that if I charge mine from an USB port on my PC it says that it is fully charged but I don't get near the battery life I would from charging at an outlet.
I also agree with what Doug says about rebooting your nook. Sometime Android has a service or app running in the background that hangs and doesn't allow your device to truly go into sleep mode. A reboot will usually fix this.
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