A female friend was at Moore's home when the actress started "shaking" and otherwise "acting like she was suffering from a seizure," a source familiar with the Los Angeles Fire Department's incident report tells E! News.
The friend then called 911 and, about 30 minutes after paramedics arrived, they determined that Moore should be taken to the hospital.
Which brings us to today.
After being hospitalized, the Margin Call star opted to seek further professional help for exhaustion and to "improve her overall health," Moore's rep said in a statement. "She looks forward to getting well and is grateful for the support of her family and friends."
Sources who saw Moore as recently as last week tell E! News that the actress has been looking increasingly thin, and we hear that friends were concerned about her weight.
Moore's rep confirmed that the star has dropped out of the Linda Lovelace biopic Lovelace, in which she had been cast as feminist icon Gloria Steinem.