1.梦游(症)者
1.someone who walks while they are sleeping. A less formal word is sleepwalker.
1.In the day, he went around like a somnambulist, with absent stare, gazing upon the world he had just discovered.
白天,他像一个梦游者似地走东走西,目光恍恍惚惚的,目不转睛地望着他这新发现的世界。