Display turns off, but turns bac on when i walk in front of it?

In order to save my battery, the display goes black after a certain amount of time. That is normal. The thing that is weird is whenever the screen is dark and then I walk past it or sit down in front of my computer, it turns back on without me touching anything... could someone have hacked into my webcam? I can't think of anything else that would make it motion sensitive like that. If anyone has any ideas of why this might be and how I can fix it more importantly please let me know. I am kind of freaked out by this. It hasn't always done this, only the past few days.
MacBook   Mac OS X (10.4.7)  

No, the built in isight light is not on. i am using an external mouse and maybe thats it. ill try and see what happens when i disconnect the mouse.

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