Police were called to Goffs Park, Southgate this morning (Thursday May 21) after concerns were raised for the welfare of a driver.
Officers attended the incident at around 7.30am.
A spokesperson for Sussex Police said a man appeared to be unconscious in a stationary car with the engine running.
The spokesperson added: “Officers attended and were quickly able to establish that he had simply been tired after working and had stopped to sleep for a while.”
The incident was closed.