Paramedics were called to Lindsay Lohan's hotel room after she was discovered unconscious.
The 25-year-old actress could not be roused by a member of staff at the Ritz-Carlton in Marina del Rey, Los Angeles, where she is currently filming Liz & Dick.
But the paramedics who attended found "nothing wrong" with her and she was not taken to hospital.
Her spokesman Steve Honig was quoted by The Sun as saying: "Lindsay has been working a gruelling schedule for the last couple of days.
"Last night she worked from 7 pm to 8 am. She was exhausted and went back to her room to sleep.
"Producers were apparently concerned and called the fire department and paramedics found her sleeping but determined that she was fine, just extremely exhausted and slightly dehydrated.
"She is on her way home now to rest and will be back on set later today."
Li-Lo is claimed by gossip site TMZ to have been complaining of feeling exhausted prior to the incident, and a doctor had been called.

She was found unconscious before he arrived.

Li-Lo later tweeted:"Note to self.. After working 85hours in 4days, and being up all night shooting, be very aware that you might pass out from exhaustion.

"7 paramedics MIGHT show up @ your door. Hopefully theyre cute. Otherwise it would be a real let down."
It has been an eventful couple of weeks for Li-Lo, who was also [uuid=ecd0b05f-7f21-46bf-a6d3-c59e468fdc98]in a car crash recently[/uuid].