I have a similar question to this one. Only my context is the 15" Retina MacBook Pro - and Windows 8. I have just the original Mac OS X Mountain Lion on there, then Windows 8 via Bootcamp. no rEFIt installed. (I just press ALT every time I restart windows, actually as a security measure to stop tech-unsavvy thugs, who, if the laptop is stolen, think it's only a mac and don't discover my Windows as quickly as they would've, and by that time I remotely activate various anti-theft mac apps and nab them that way).

SO: like the related question asks, why isn't it behaving like it should? The Windows 7 FAQ states:

Will sleep eventually drain my laptop battery?

If your laptop battery charge gets critically low while the computer is asleep, Windows automatically puts the laptop into hibernation mode.

But this is just not happening - on my rMBP Windows 8.

It seems EVERY time I set the laptop to sleep (when it reaches 10%), then arriving home and plugging it in and hoping to simply resume my work, it does NOT save the session to disk and I lose ALL my work.

Who's fault is it? Win 8's (a bug, grr)? Or Apple's EFI system (maybe fixable via editing EFI options/do I have to install refit to make it work perhaps?) Or maybe changing windows power options can somehow fix the problem?

Thanks for your help.