Keyboard + Trackpad not working

[MacRacer]

I am a proud owner of a 15" MacBook Pro, 2.5 GHz, 2 BG, 250 GB Hard Drive. I have only own this Mac for about 4 months. Just yesterday, while at school, my MBP went into the screen saver mode and the LED lighting dimmed. When I went to type something in Pages, my MBP won't come out of the screen saver. I typed some keys and tried to move the mouse but nothing happened. When I plugged my Logitech Cordless Mouse in, the courser moved on the screen and the MBP came out of the screen saver mode, but the keyboard and trackpad still didn't work. I restarted the computer and the keyboard and trackpad worked fine until it went back into the screen saver. Could anybody give my advice on how to fix this issue so it won't happen again.🙁