How to recover file after battery exhaustion

How do I recover unsaved files after battery exhaustion? Before my snow leopard installation, when I replug power after battery exhaustion, the system would restart and resume the desktop with my working files. After I installed snow leopard, the system simply went for a complete reboot every time I replug power after battery died, and thus I couldn't find the files I worked on unless I saved them. How do I find/recover the unsaved files?
I use macbook and snow leopard. Any advice would be highly appreciated!

I think you are seriously confused about terminology, as your post doesn't make a lot of sense. Rebooting refers to the act of restarting the Mac, just as if you turned off the machine and then turned it back on again. It restarts the system from scratch (ie, with a "fresh desktop").
Sleep is a completely different thing. It allows the machine to stay on while cutting power to as many components as possible. This allows the machine to look like it's turned off, but it retains its state and wakes up with all the same apps/windows open.
If you are putting your machine to sleep and finding later that it has not retained the state, as you seem to be saying, that means the battery has died and the machine shut down. Not a nice, gentle shut down, like when you choose Apple -> Shut Down, but an abrupt, kick-in-the-head sort of shut down that has the potential to do damage to your system software. Not to mention that you'll lose unsaved changes to open documents. This is a problem, and you need to address it.

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