Long title for this post! But I wanted to cover the bases for anyone who is experiencing issues with their Apple laptop having problems with sleeping since I’ve heard about the problem a few times.
There is likely more than one reason that your battery will drain while in sleep mode. There are many models of MBP and MB with different motherboards and firmware settings.
That being said, this is just something that you have to be more conscious about in the Intel macs than you had to with the PowerPC model powerbooks. Apple should do a better job at warning people about these common user issues. Don’t blame them for not thinking of every possible situation where settings are implemented for convenience (such as allowing bluetooth or LAN access to wake your computer from sleep).
Here are some likely culprits of your macbook pro not sleeping correctly while the cover is closed from most likely to least likely scenarios:
1. Bluetooth is waking computer if you have a bluetooth device nearby.
2. SMC (System Management Controller) is buggy and needs to be reset.
3. Closing lid instead of going to: Apple Menu > Sleep
4. Leaving internet applications (Safari, Firefox) open with web pages (running apps and things) that can stall / prevent sleep by accessing your hard drives.
5. Leaving DVD player open or iTunes playing a song when you close the lid.
6. Leaving open connections to your computer through sharing services (afp, smb, ftp).
7. Spotlight indexing is taking place.
Apple’s excellent article on the topic is located here:
I hope that this helps everyone out with their mb\macbook pro sleeping \ battery drain \ getting really hot issues.