My MacBook Pro's Battery drained out while on sleep?

Hi all,
I bought a MacBook Pro Retina Display Late 2013, and I have had it for almost two months now, but the thing is I just noticed this morning that the battery was all drained after I put it on sleep for more than a day, I can say maybe 30 hours, and the battery was at like 60% before putting it to sleep. I have never had this for the two months that I owned it, however, I also realized that it might have been affected due to the load of emails I have gotten last night (like 250+ emails) from twitter, Facebook, school, work and other emails.
I did check the energy settings and everything seems to be fine (the nap settings is disabled so my Mac doesn't do anything while sleeping) that is why I am concerned, I really do not want to bring it back to Apple, but it sucks if I have to!
Thank you all

Nick2014-05-03T07:11:51Z

Sounds like the battery is probably defective. You should bring it back to apple :(