A four-year-old boy stole his mother's car while she slept and took it for a joy ride, before crashing into a pick-up truck.The mother was fast asleep at her home in Garsnas, Sweden, when her son took her car keys and drove off.He managed to drive for about a quarter of a mile, successfully making three right turns, before crashing into the truck.The first his mother knew about the incident was when she was awoken by a local shopkeeper knocking at her door to bring her son home."When she explained that my son had been out driving the car I thought it was a terrible joke at first. I couldn't believe it was true," the mother told the local Ystads Allehanda newspaper."I have no idea how he managed, he's never driven a car before," she added. "I had the car keys in my jacket pocket and it was hanging so high that I thought he couldn't reach it. But he did. Don't ask me how, I was asleep."A local police spokesman said officers would not be pressing charges - and were glad that no one was injured.