Hi All,
This problem was annoying me for quite a long time. I'v tried many many solutions but not help.
Finally I think I found the solution for my 13" MBP late 2011. Now, My MBP Running without problem for 2-3 weeks since fixed.
Hope this may help you.
My MBP Spec.
13" MBP late 2011
Upgraded Memory to 8GB
SAMSUNG SSD 256Gb
The following is my step..
1. Run OnyX to clean system
2. Varify the login item in system preferences.
3. Boot into Safemode, login as root
3.1 Then launch Disk utility: verify Disk, repair permission
3.2 Using Terminal:
Backup folder /var/log as /var/log.backup. Then delete all contents in its "rm -Rf /var/log/*"
Increase standbydelay "sudo pmset -g standbydelay 151200". (You may use the different value)
If you want to diable hibernatemode, just "sudo pmset -a hibernatemode 0" (mine was leave it as mode 3 without problem, but set it to 0 is a little bit faster wakeup)
4. Resetting NVRAM/PRAM
http://support.apple.com/kb/HT1379?viewlocale=en_US&locale=en_US
5. Resetting SMC
http://support.apple.com/kb/ht3964
6. reboot system again.
Optional:
Due to my disk is SSD so i prefer to disable Sudden Motion Sensor by "sudo pmset -a sms 0"