LONDON, England - A teenage sleepwalker was rescued after being found fast asleep 130 feet (40 metres) up on the arm of a crane, police said on Wednesday.

Emergency services were called to a building site in London after a passer-by spotted the 15 year old curled up on top of a concrete counterweight high above the ground. The teenager, who has not been named, had climbed up the crane and walked across a narrow metal beam while fast asleep during the incident, which happened on June 25.

It is believed the teenager had walked out un-noticed from her home near the site in Dulwich, southeast London. She was brought down in a hydraulic lift after a two-hour rescue operation.

"Police and London Fire Brigade attended and the woman was brought down from the crane at around 4.a.m and taken to hospital for precautionary checks  a police spokeswoman said.

The girl was unharmed and later went home.