macbook pro, light keeps dimming.

I can't find this in any of the settings, but after a minute my display dims.... I mean i can still see everything but its dimmer.

After i move my mouse it undims, but it sucks when im reading something and the light dims in the middle of me reading.

Its distracting to have to move the mouse and read at the same time.

Any ideas? I have ambient lighting turned off and it didn't solve the problem.

Try System Preferences > Energy Saver and check your time options.

Same place he showed you in the pic above, but select 'Options' and remove the check mark from 'Automatically reduce the brightness of the display before....."