My MacBook Pros screen randomly turns off

[MBPCAG]

While I am typing a paper my screen will randomly turn off for a few seconds and that's what scares me. Why is it doing this? I don't want it to shut down while I am writing My lab reports!! It also does it any other time it's random

 

[simsaladimbamba]

What exact MacBook with what exact Mac OS X version do you use and does it only happen during the use of one certain application?

To find out what Mac OS X version you run, click > About This Mac:

To find out, what exact Mac model you use, click > About This Mac > More Info > Hardware Overview:

To see a more elaborate image explaining the above steps, click here.
To see a more detailed video tutorial showing the above steps, click here (2 MB, 23s, .mp4).​

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[MBPCAG]

I have a 13" mid 2009 MacBook Pro with OSX 10.8.2. Thank you for your help!