Because it isn't shutting down stuff to go to sleep.
It uses the same amount of power while awake, but not turning off stuff when it's idle, screeen off and just sitting there. Power it off if you're not going to use it for hours and you'll be good.
Like Jomboni said, it'll be addressed in a future update. Maybe when the source code is released from the 1.2 update, it will help with things like that.
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