1. a person who walks while asleep; a sleepwalker
Usage: formal

Examples

• The somnambulist wandered through the house in the middle of the night.
• Doctors studied the somnambulist to understand sleep disorders better.
• She discovered she was a somnambulist when her roommate found her cooking while asleep.
• The somnambulist had no memory of his nighttime activities.
• Safety measures were installed to protect the young somnambulist from harm.
• The family was concerned about their child’s behavior as a somnambulist.