[ noun ] someone who walks about in their sleep <noun.person>
Sleepwalker \Sleep"walk`er\, n. One who walks in his sleep; a somnambulist.
Instead, she finds another unseeing sleepwalker, and it is this man who is plainly her destiny.
And a magazine story early in his tenure at Justice quoted an administration official as calling him a "somnambulist," or sleepwalker, a description that rankled him.