My twelve-year-old brother unconsciously pees all over the bathroom floor in the mornings. Is something wrong?

My little brother has this problem--when he goes to the bathroom in the morning, he unconsciously pees all over the floor. Like, puddles. When I confront him about it, he seems completely aware that he did it and has no explanation for WHY. I asked if he did it on purpose, and he didn't deny it. I'm wondering if this could be some kind of psychological thing. He's done this for a while now. For a time, he seemed to stop (he had taken to peeing behind the wastebasket back then, whereas now he just pees all around the toilet), and only recently picked it back up again. It's starting to worry me. Not only that, but I'm kind of disgusted by pee and would like to not have to clean it up off the floor anymore.