sleepwalker

from WordNet (r) 3.0 (2006)
sleepwalker
    n 1: someone who walks about in their sleep [syn: {sleepwalker},
         {somnambulist}, {noctambulist}]
from The Collaborative International Dictionary of English v.0.48
Sleepwalker \Sleep"walk`er\, n.
   One who walks in his sleep; a somnambulist.
   [1913 Webster]
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