While most people’s bodies remain still during REM sleep, people with REM behavior disorder act out their dreams, reports Leader-Telegram.

“I’m not a violent person. I’m not an angry person. I love my wife very much,” said Bochte, 32, of Madison, a computer programmer at the University of Wisconsin Survey Center. “To have my body hijacked and punching her is just horrifying.”

This week, a researcher put a net lined with more than 250 electrodes on Bochte’s head before he underwent a sleep evaluation. It was part of a UW-Madison study on five kinds of sleep disorders: REM behavior disorder, sleepwalking, sleep talking, night terrors and sexsomnia, when people engage in sex while asleep.