How to execute long processes without MacBook going to sleep?

For work, I often have to upload large disk images that can take 4 hours to upload. I usually upload them at night using command-line scp.
Problem is, the computer will go to sleep and stop uploading.
I don't want to turn sleep off altogether. Is there anything I can do to prevent the machine from sleeping until a process like uploading is finished?
Ideally, I'd like to start the upload, close the lid, and have it go to sleep after it's done.
Anyway to do that?
MacBook   Mac OS X (10.4.6)  

Try Jiggler. It's pretty cool. It's simple. It basically moves your cursor around so the MacBook stays awake. You can control it (shut it off or turn it on) so that it's not affecting the computer all the time. I haven't used it for a while but I don't think there was a way to set a specific time for it so having it stop so you MB shuts down eventually might not be possible. But I used it a while back when I was encoding video and it worked pretty well for something so simple.

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