What is "Sleep Im age"? Can I delete it?

Hi,
Using Grand Perspective I have been able to identify huge worthless files mostly of my own making but found one called "Sleep Image" that resides here:
Private>var>vm> sleepimage
It's 4gig of ...something...
Can I safely delete this....thing...?
Thanks,
Warren

On Windows, this would be called the "hibernate file". Bascially, it's the contents of your RAM when the machine goes to sleep. The idea is that if power is lost/batteries die while the computer is asleep, the image contained therein permits you to restart the machine when power is restored as if it were waking normally from sleep.
You can delete this file, just keep in mind that it's automatically recreated and it will always be just a bit bigger than the total amount of RAM installed in your system (typically, RAM + video RAM + a little more). Actually, there's really no point in deleting it.

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