The girl apparently remembers dreaming that the house was on fire, putting on her boots and unlocking the front door,[...] She must've been out for several hours," the aunt says[...]
Read more: bbc.com
Thank god it was Norway, in the States Child Protective Services would have taken the child in custody as well as her parents and started a nice six month long wheel spinning investigation.
However, 5 km. (3 miles) is a long haul for a sleeping four year old wearing undies and boots in crap weather.