dd does it very occasionally. We want to get bunkbeds. Don't know if this is a complete no no (she would be on top) or if the fact that sleepwalkers can open doors, drive cars etc suggests that her sleep walking wouldn't necessarily make bunkbeds hazardous.
Would love to hear from others with sleepwalking children. Had thought not to get them to be safe, but she hasn't sleepwalked for weeks now and wonder if being over-cautious.