Sleepwalking 5 year old..

My son is 5 years old...

Tonight around 10pm he woke up and came in my bedroom and woke me up. He just kept saying the words"I need, I need" I kept asking him what he needed but no answer. I fallowed him into our hallway and all of a sudden he pees all over himself and the floor. I got him some clean clothes and cleaned him off and put him back to bed. The whole time he acted like he did not know anything. This is his first time doing this. Anyone else child did this before?