OS X experiencing failure at long sleep
Have you tried to reset the SMC and NVRAM?


  To reset the SMC:
  
  
  Shut down the computer.
  Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
  On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  Release all the keys and the power button at the same time.
  Press the power button to turn on the computer.
  


Source : Apple KB - Resetting the System Management Controller (SMC) on your Mac


  To reset the NVRAM (PRAM)
  
  
  Shut down your Mac.
  Locate the following keys on the keyboard: Command (⌘), Option, P, and R. 
  Turn on your Mac.
  Press and hold the Command-Option-P-R keys immediately after you hear the startup sound.
  Hold these keys until the computer restarts and you hear the startup sound for a second time.
  Release the keys.
  


Source : Apple KB - How to Reset NVRAM on your Mac