somnambulist
  夢遊者
  som·nam·bu·list /-ləst/ 名詞
  夢行者
  Som·nam·bu·list n. A person who is subject to somnambulism; one who walks in his sleep; a sleepwalker; a noctambulist.
  Syn: -- somnambulator.
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  somnambulist
       n : someone who walks about in their sleep [syn: sleepwalker,
           noctambulist]