All the time, up until I turned 25 or so. As a kid, I walked around the house and peed in closets and air vents. As a teen, I pulled the top bunk off the bunk beds and carried it on my back across the room -I swore a bear attacked me...and I had the marks on my back to prove it. At twenty, I walked into my 250 lb roomate's room and threw him out of bed, after mumbling some incoherant stuff. At 22 or so, I woke up on top of my ex- wife with my hands around her neck.
Then it stopped...thank God. All of those events occured when I was excessively exhausted. Now my ten year old daughter roams the house at night in her sleep.