Rudy and the Secret Sleepskater

When Rudy goes to Femi's house for a sleepover, he discovers that his friend has been keeping a secret: Femi sleepwalks. And when Rudy accidentally leaves the bedroom window open he learns that not only does Femi walk in his sleep, he also skateboards in his sleep. At great speed. Can he guide Femi back to safety without waking him up?