The 31-year-old woman, who has a history of sleepwalking, was found on the bank of the Snake River near her home in Burley, Idaho.
She was suffering from hypothermia and had to be taken to a local medical center for treatment.
The woman's husband sounded the alarm in the early hours of Tuesday morning after he discovered his wife missing and a sliding glass door in their house left open.
Police and neighbors began combing the area and discovered the woman about a quarter of a mile downstream from her home.
Reports indicate that this was the third incident in five weeks involving the woman, who is now being referred to a mental health specialist.
Mental health specialist? She should be given a top-ranking government position, the woman is clearly a multitasking genius...
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"I can't think of a single disadvantage to this sleep-swimming malarkey"