Actress Lindsay Lohan is said to be "fine" after she was treated for exhaustion and dehydration by paramedics who rushed to her California hotel room.
The incident comes a week after the car she was in smashed into an 18-wheel truck on the Pacific Coast Highway, west of Los Angeles.
Her spokesman, Steve Honig, denied earlier reports that the 25-year-old had been taken to hospital.
Lohan is staying at the Ritz-Carlton in Marina del Rey during filming of Liz & Dick, a TV biopic of Elizabeth Taylor and Richard Burton's romance.
Mr Honig said: "Producers were concerned when she did not come out of her room and called paramedics as a precaution.
"Lindsay was examined and is fine, but did suffer some exhaustion and dehydration," he said in a statement.
"She is resting now and is hoping to be back on set later this afternoon."
Earlier, a local ABC news channel in Los Angeles reported that Lohan had been found unconscious and rushed to hospital.
Lohan has been in and out of trouble since a 2007 arrest for drug possession and driving under the influence of alcohol.
In his statement, Mr Honig said the actress had "worked a gruelling schedule the past few days.
"She was on set last night at 7pm and worked through the night until 8am this morning. She took a nap before shooting her final scene," Mr Honig said.
The incident is the latest scare for Lohan, whose car crash last Friday sent her and her assistant to hospital.
The pair were on the way to a shoot for Liz & Dick when the Porsche they were in collided with the truck.
Neither was seriously injured and Lohan resumed shooting later in the day.
The accident remains under investigation and police have said they are still trying to determine who was driving.
Lohan remains on informal probation for taking a necklace last year from a jewellery store without permission.
In March, an LA judge formally ended Lohan's probation after a long string of court appearances, but told the The Parent Trap and Freaky Friday star to "stop the nightclubbing" and behave more maturely.