Taylor Gammel, 19, also stopped at a store but stayed asleep the whole time and did not remember a thing afterwards.
The 19-year-old sparked a panic at 6am when her father woke up and found she was missing from their home in Arvada, Colorado.
Miss Gammel has a history of sleepwalking and police put out an alert for her.
They also put a dog out hunting the streets and distributed her picture on the internet and TV.
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Three hours and nine miles later, Miss Gammel was found by her cousins in another town, still asleep in her pyjamas on a chair.
Her father Steve said: '“She just starts walking. And I don’t think she knows where she's going or what she’s doing which makes it even scarier.”
Mark Techmeyer of the Jefferson County Sheriff’s Office told Mirror UK: “She did not have shoes, No phone, no money, no purse, no anything. She got up and walked out of the house.
“She has no recollection of being on a bus, and she had no money on her.”
Miss Gammel suffers from a severe form of sleepwalking which affects between one percent and 15 percent of the population, mostly children.
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