noctambulist

/nɑkˈtæmbjəlɪst/
noun
  1. A person who walks while asleep; a sleepwalker.
    • As a child, he was a frequent noctambulist, often found in the hallway.
    • The family installed a gate at the top of the stairs to protect the noctambulist.
    • The noctambulist wandered into the living room and stood staring at the wall.
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