subject: Does Adult Sleepwalking Sound Funny? [print this page] The good news for girls is that boys are more prone to this condition. An episode of sleepwalking starts around one and a half hour after the person has gone to sleep. The condition can persist for a few seconds, but can also last for more than half an hour. The incident of this potentially dangerous problem can be reduced by medication. However, it is important to consult a doctor for a prescription. After all, sleepwalking is a serious problem and needs to be addressed immediately.