The actress was exhausted and dehydrated when paramedics examined her Friday but is doing fine and will continue filming her current movie, a spokesman said.
Following the incident, on her registered Twitter account, Lohan tweeted Saturday in two consecutive posts: "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."
Lohan is filming a Lifetime television movie in which she portrays Elizabeth Taylor.
The incident came a week after Lohan's Porsche collided with a dump truck on Pacific Coast Highway.
Police are continuing to investigate the crash, which sent Lohan to the hospital for observation.
A spokesman said Friday that Lohan was feeling better.
"She is resting now and is hoping to be back on set later this afternoon," spokesman Steve Honig told The Times' Ministry of Gossip.
"Lindsay has been working a grueling schedule for the last couple of days," Honig told the E! News website. "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."
The crash on PCH occurred during an upswing in Lohan's fortunes after several years of incidents that had her in court numerous times. Lohan has said she's learned her lessons from the problems.
She was on probation for a 2007 conviction for driving under the influence. Since then she has also been convicted of shoplifting and was on probation for that offense as well.
Lohan was sent to jail several times for violating the terms of her probation, but she followed a strict regimen of counseling and community service at the county morgue. In March, a judge ended her probation in the DUI case and reduced the shoplifting probation to unsupervised status.