Sleepwalking generally occurs during deep sleep, but may also be present during periods of NREM (non-rapid eye movement) sleep. It is most common in children, although the National Sleep Foundation estimates that 1 percent to 15 percent of the population may be sleepwalkers. Sleepwalkers generally remain asleep and do not remember leaving their beds. Contrary to popular myth, sleepwalkers should be awakened, although they may be confused when awakened.