Low battery - when sleeping, what should happen

When the battery is low, and I put the macbook pro to sleep, when I come back to the machine its dead. Now I can understand that the battery has exhausted, but my trusty Thinkpad would have hibernated so it wouldn't matter. Just mains, and off you go. This doesn't happen with the Mac, it's a start again, and possible corruption. Is this meant to happen?

Several components, including the RAM, remain powered during sleep - if the battery is low when you sleep, it can run all the way down, forcing a shutdown. No corruption should occur - the MBP uses a "safe sleep" (writes the current state to the hard disk, but this is not saved across a restart). However, a complete shut down will require you to restart.
Personally, I find a complete boot up on my MBP significantly faster than my HP laptop coming out of hibernation.

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