A man who froze to death in Wisconsin while sleepwalking outdoors was found to have a bottle of Ambien in his bedroom, but it has not been determined whether he took the medication on the night of his death.

Timothy Brueggeman, 51, was found outside his rural home Tuesday morning when the temperature was minus 16 degrees. He was wearing only underwear and a fleece shirt, and died of hypothermia, authorities said.

Ambien, the most-prescribed sleeping pill in the nation, has been linked to hundreds of cases of sleepwalking, sleep-driving and even sleep-shoplifting.

Brueggeman's mother, Geraldine Brueggeman, said she advised him to quit taking Ambien last summer after he drove his pickup truck without waking up.

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