sleepwalking is a sleep disorder characterized by walking or other activity while seemingly still asleep, REM sleep behavior disorder (RBD) is a parasomnia. A parasomnia involves undesired events that happen ... RBD can be confused with sleepwalking and sleep terrors. In these other disorders, the sleeper is usually ... RBD episodes occur during rapid-eye-movement (REM) sleep. Normal sleep consists of a series of REM ...