Why is the battery on my macbook air draining so fast?

Hi there:
I have a 2 week new Macbook Air 13'', mid 2013 model. Yesterday, after being prompted to update to the latest of Mavericks, i have unplugged the laptop and left it in sleep mode. Overnight it went from 100% charged to 0.
Has anyone experienced something similar?
Any help, or advice are appreciated.

You have a 14 day exchange period.  Take care of that now before time runs out.
100 to 0 overnight on sleep shouldn't happen.
However dont leave your Air on sleep overnight, turn it off.

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