Sleepwalking is a sleep disorder that occurs when a person walks or performs other complex behaviors while still asleep. It typically happens during the NREM sleep stage, usually in the first third of the night. Sleepwalkers may have their eyes open but are not aware of their surroundings and often do not remember the episode upon waking. This condition is more common in children but can also affect adults. Factors such as stress, sleep deprivation, and certain medications can trigger sleepwalking episodes. While it is generally harmless, it can lead to accidents or injuries, so ensuring a safe environment is important for those who sleepwalk.