Speaking to E!, a source explained, "She slipped up and thought she could handle it". Two of Lovato's friends were reportedly with her at the time, and had treated her with Narcan, a drug used in cases of narcotic overdoses.
Towards the end of the call, a male voice at the house tells the dispatcher, "We heard the sirens".
It's believed Demi will go to rehab when she leaves hospital.
The source added that Lovato is "human" and the high expectations she set for herself "got to be too much".
Lovato indicated in a new song released last month that she relapsed after six years of sobriety. She will need several weeks of detox work and intense therapy.
Lovato's role as aspiring singer Mitchie Torres in the Disney TV movie "Camp Rock" introduced the world to her musical talent.
She also shared a picture of the tattoo sketch.
Longest Total Lunar Eclipse of Century on Friday
Fiery Mars will add to the spectacle as it appears directly below the blood moon at close to its maximum brightness. NASA said the total lunar eclipse will last almost two hours Friday night, turning the moon a reddish orange color.
Rangers trade Cole Hamels to Cubs
With Hamels in tow, the Cubs could also opt to move Chatwood into the bullpen in an attempt to get his mechanics smoothed out. In his last home start for Texas before the deadline, Hamels allowed seven runs on Monday night against Oakland.
Trump, Putin and the case of the missing question
However, Mr Trump has previously suggested that United States opposition to Russia's annexation of Crimea could be reconsidered.
"Mama, I'm sorry I'm not sober anymore / And Daddy, please forgive me / For the drinks spilled on the floor / To the ones that never left me / We've been down this road before / I'm so sorry, I'm not sober anymore".
"She actually helped me get through my stuff because I was watching her and was like, 'I know I'm not alone, '" Trainor said in an interview with The Associated Press on Thursday. Her 2015 album, "Confident", earned her a Grammy nomination for best pop vocal album.
The "Skyscraper" singer is "grateful to be alive" after her brush with death but doubts are being raised about whether she really wants to go back to rehab, People Magazine Music Editor Janine Rubenstein said.
After three seasons on "Sonny with a Chance", Lovato announced she was leaving the show to focus on recording and her third album, "Unbroken". It's easy to continue abusing when you can shrug your shoulders and tell yourself you have everything under control'.
This story was first published on CNN.com, "What Demi Lovato has said about sobriety and mental health".
Fox said it would pull its episode of "Beat Shazam" featuring Lovato, which was to air Tuesday night, because of the recent news.
She last performed July 22 at the California Mid-State Fair in Paso Robles, California.