When a MacBook hibernates, it isn't actually hibernation in the Windows sense. Apple calls it Safe Sleep. The restoration from Safe Sleep isn't meant to be a regularly-occurring event; it's there for emergencies only. From my experience, my Late 2007 MacBook Pro uses such a miniscule amount of power while sleeping (normally) that I have left it sleeping for weeks (while on vacation), opened it up and still had a significant amount of batter power remaining. I'm sure with the new 7+ hour batteries, you could leave it sleeping for months.
To put it quite simply, there's no easy way to save the system state on OS X, besides sleeping the computer and popping the ba-... oh, wait, no more removable batteries.
If you're really adamant about getting this functionality, you can try the Deep Sleep widget. Best of luck to you.
Read full article from mac - How can I manually put a Macbook Pro to hibernate without going to sleep mode first? - Super User
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