There is a possibility out there that Demi was toking SPICE at the time 911 was called to ehr residence.   It's a synthetic form of pot also known as K2 or herbal incense.
According to "Us Weekly",  some medical studies have linked spice to,  "psychosis, heart attacks and convulsions."
A doctor from Harvard Medical School says,  "We see a lot of emergency room visits related to spice because people start to feel unreal or they hallucinate or they are very sedated so they become frightened and they have panic attacks."
He added that fatal overdoses are rare, and usually result from mixing spice with alcohol or other drugs.
Sources close to Demi say she hasn't been drinking alcohol lately, but she downs  tons of Red Bull, and she never eats.  Sarah Jessica Parker will replace Demi Moore in the Linda Lovelace Movie:  the upcoming movie about '70s mattress actress Lind Lovelave.