Locked Jaw?

When i was eating breakfast, my jaw kept making this popping sound...After a while, couldnt bite normally and open my mouth wide...Haf no idea what happened...Locked jaw perhaps? i think it's cos i grind my teeth in my sleep so my jaw's kinda overworked...Hope it goes away soon...Wanna chomp down a carl's jr. guacamole burger some time this week...hmmm...