Fn+NumPad0 puts my Laptop to sleep. How can I disable this?

When I press the function key (Fn) and the 0 on the number pad (NumPad0), my laptop goes to sleep. Someone at Del thought this was a good idea, and I've no idea why. There is nothing on the NumPad0 to indicate that it's a function key. And toggling the function key lock doesnt affect it. I also have a sleep function key, Fn+Insert, which does the exact same thing, and has a picture on it to show that's what it does. Is there anyway I can prevent this key combination, Fn+NumPad0, from putting my laptop to sleep? The problem is that the NumPad0 key is very close to the RightArrow key. I often need to move to the end the line my cursor is on, or the end of the page, and the End key is a function key, Fn+RightArrow. This often results in an acidental mistype of Fn+NumPad0, and my laptop goes to sleep. Any help appreciated!