Police say they have arrested a suspected car thief whom they caught napping at the wheel of a stolen car.

South Australia Police say the 30-year-old man drove the Audi convertible into an automatic car wash early Monday and apparently fell asleep. A service station attendant called the police at 3 a.m. when he noticed the car hadn't moved for an hour.

The police said in a statement that the car has two different license plates and that police discovered it had been reported stolen in July. They woke the man and arrested him on charges of illegal use and theft of the car.

He has been released on bail and will face court in September.