MBPr 13 losing half charge overnight while asleep

hello, i am new to Mac, have been using windows for over a decade now. so still learning ins and out of mac osx.
but i have encountered something rather puzzling. randomly, my MBPr 13 would lose more than half its charge (yesterday night it went from 100 to 51 percent battery) overnight while in sleep mode. when this happens the lower plate is very warm.
i dont know what is going on, as this doesn't happen all the time, it has happened may be 5 times over last 2 to 3 weeks. but this doesn't give me confidence to leave the machine off charger even when i am not using it.
if anyone else has similar experience, or knows the solution, i would really appreciate it.
thank you.

Hi chirantanf,
Thanks for visiting Apple Support Communities.
It sounds like your MacBook Pro may not be going into or staying in sleep mode.
I recommend first checking for the following:
How can I determine what is causing a sleep issue and how can I resolve it?
These are the most likely causes and solutions for sleep issues:
Sharing preferences: Enabling sharing for any connections can potentially disable sleep. Turn off file sharing if it's not being used.
Bluetooth settings: Bluetooth can wake your computer if you set the "Allow Bluetooth devices to wake this computer" checkbox in Bluetooth System Preferences.
Are a keyboard and mouse connected and working correctly?
Do you have any other external USB or FireWire devices connected? Try removing or disconnecting them one by one, when not in use, taking care to dismount any that are storage devices before disconnecting them.
Do you have a print job in the Printer Queue? Remove any print jobs that are in the queue.
Is Spotlight indexing? This can take anywhere from several minutes to several hours after a new installation, or after connecting a storage device which contains unindexed data. Indexing prevents idle sleep.
Additional Software: Try a Safe Boot to help isolate a software issue.
Put your ear near your computer. Do you hear the "clicking" sounds of hard disk access?
Energy Saver settings: If the computer and display sleep timers are set to "Never", the computer will not sleep.
You can find this information here:
Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/ht1776
Regards,
Jeremy

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