Demi Lovato: Details emerge on hours leading up to alleged overdose

The details are still fuzzy on the circumstances surrounding Demi Lovato's reported overdose, but new reports suggest that a night of hard partying led up to the Tuesday morning incident.

According to TMZ, which was the first outlet to break news of Lovato's apparent OD, an all-night party at Lovato's house stretched into the morning. But by the time first responders arrived to an emergency call, the house was empty except for members of Lovato's team.

It's unclear when her guests left the house: It's possible that people had been gone for hours, but also possible that they quickly exited upon word of the grave medical situation, fleeing before medics appeared on-site to administer Narcan.

40 PHOTOS
Demi Lovato, from past to present
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Demi Lovato, from past to present
LOS ANGELES, CA - NOVEMBER 23: Demi Lovato attends 2008 American Music Awards at Nokia Theatre on November 23, 2008 in Los Angeles, CA. (Photo by ANDREAS BRANCH/Patrick McMullan via Getty Images)
HOLLYWOOD - NOVEMBER 30: Recording artist Demi Lovato performs onstage at the 2008 Hollywood Holiday Winterfest on November 30, 2008 in Hollywood, California. (Photo by Valerie Macon/Getty Images)
WESTWOOD, CA - NOVEMBER 17: Demi Lovato arrives at the Los Angeles premiere of 'Twilight' at the Mann Village and Bruin Theaters on November 17, 2008 in Westwood, California. (Photo by Steve Granitz/WireImage)
Demi Lovato Arrives For The Disney Channel European Premiere Of Camp Rock At The Royal Festival Hall On The South Bank In Central London. (Photo by Justin Goff\UK Press via Getty Images)
UNIVERSAL CITY, CA - SEPTEMBER 14: Actress/singer Demi Lovato arrives at the City of Hope benefit concert at the Gibson Amphitheater on September 14, 2008 in Universal City, California. (Photo by Lester Cohen/WireImage)
NEILL J. SCHUTZER/�2008 RAMEY PHOTO NEW YORK 8/29/08 DEMI LOVATO LEAVING HER HOTEL IN NEW YORK NJSSR (Photo by Philip Ramey/Corbis via Getty Images)
NEW YORK - SEPTEMBER 03: Demi Lovato seen on the streets of Manhattan on September 3, 2008 in New York City. (Photo by James Devaney/WireImage)
Singer Demi Lovato arrives at the 2008 Teen Choice Awards at Gibson Amphitheater on August 3, 2008 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
LOS ANGELES, CA - NOVEMBER 22: Demi Lovato attends 2009 AMERICAN MUSIC AWARDS at NOKIA Theatre LA Live on November 22, 2009 in Los Angeles, California. (Photo by ANDREAS BRANCH/Patrick McMullan via Getty Images)
Singer Demi Lovato performs onstage during City of Hope's 2nd Annual Concert For Hope at Nokia Theatre L.A. Live on October 25, 2009 in Los Angeles, California. (Photo by Jeff Kravitz/FilmMagic)
LOS ANGELES, CA - OCTOBER 25: Recording artist Demi Lovato arrives for Disney's 2nd Annual Concert For Hope at the Nokia Theatre on October 25, 2009 in Los Angeles, California. (Photo by Kristian Dowling/Getty Images)
Recording artist Demi Lovato spends an hour meeting fans and signing autographs at an AT&T store in Orlando, Florida, Sunday, August 2, 2009. (Photo by Nick Masuda/Orlando Sentinel/MCT via Getty Images)
LATE NIGHT WITH JIMMY FALLON -- Episode 883 -- Pictured: Demi Lovato during a skit on September 3, 2013 -- (Photo by: Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images)
LOS ANGELES, CA - OCTOBER 12: Demi Lovato attends the 2010 American Music Awards nomination announcements held at JW Marriott - Los Angeles at L.A. LIVE on October 12, 2010 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
HOLLYWOOD, CA - SEPTEMBER 23: Demi Lovato arrives at Padres Contra El Cancer's 25th Anniversary Gala Honoring George Lopez & Enrique Alejo at The Hollywood Palladium on September 23, 2010 in Hollywood, CA. (Photo by Gregg DeGuire/FilmMagic)
- AUGUST 18: Demi Lovato attends Disney Channel Hosts 'Camp Rock 2: The Final Jam' at Alice Tully Hall at Lincoln Center on August 18, 2010 in New York City. (Photo by RICHARD KOEK/Patrick McMullan via Getty Images)
GOOD MORNING AMERICA - Celebrating the release of the movie musical 'Camp Rock 2: The Final Jam,' which premieres September 3rd on the Disney Channel, Demi Lovato and cast members rock Central Park as part of the GMA Summer Concert Series, on GOOD MORNING AMERICA, 8/13/10 airing on the ABC Television Network. GM10 (Photo by Ida Mae Astute/ABC via Getty Images) DEMI LOVATO
SUNRISE, FL - DECEMBER 10: Demi Lovato performs at the Y 100 Jingle Ball at BankAtlantic Center on December 10, 2011 in Sunrise, Florida. (Photo by Gustavo Caballero/WireImage)
LAS VEGAS, NV - NOVEMBER 10: Singer/actress Demi Lovato arrives at the 12th annual Latin GRAMMY Awards at the Mandalay Bay Resort & Casino on November 10, 2011 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
LOS ANGELES, CA - OCTOBER 11: Demi Lovato is seen on October 11, 2011 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LOS ANGELES, CA - OCTOBER 11: Demi Lovato visits Extra at The Grove on October 11, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - DECEMBER 20: Singer/tv personality Demi Lovato attends the season finale of Fox's 'The X Factor' at CBS Television City on December 20, 2012 in Los Angeles, California. (Photo by Barry King/FilmMagic)
LOS ANGELES, CA - DECEMBER 17: X Factor Judge Demi Lovato attends Fox's 'The X Factor' season finale news conference at CBS Television City on December 17, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
LOS ANGELES, CA - DECEMBER 16: Demi Lovato performs onstage at the 'VH1 Divas' show held at The Shrine Auditorium on December 16, 2012 in Los Angeles, California. (Photo by Michael Tran/FilmMagic)
SUNRISE, FL - DECEMBER 20: Demi Lovato participates in Y 100 Jingle Ball at BB&T Center on December 20, 2013 in Sunrise, Florida. (Photo by Aaron Davidson/WireImage)
BEVERLY HILLS, CA - DECEMBER 11: Singer Demi Lovato attends The Hollywood Reporter's 22nd annual Women In Entertainment Breakfast Honoring Oprah Winfrey at Beverly Hills Hotel on December 11, 2013 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
TAMPA, FL - DECEMBER 22: Demi Lovato performs onstage during 93.3 FLZ�s Jingle Ball 2014 at Amalie Arena on December 22, 2014 in Tampa, Florida. (Photo by Tim Boyles/Getty Images for iHeartMedia)
CHICAGO, IL - DECEMBER 18: Singer Demi Lovato attends 103.5 KISS FM's Jingle Ball on December 18, 2014 in Chicago, Illinois. (Photo by Gabriel Grams/FilmMagic)
WASHINGTON, DC - DECEMBER 15: Demi Lovato attends HOT 99.5�s Jingle Ball 2014, Presented by Mattress Warehouse at the Verizon Center on December 15, 2014 in Washington, D.C. (Photo by Larry French/Getty Images for iHeartMedia)
Demi Lovato performs during Dick Clark's New Year's Rockin' Eve at Times Square on December 31, 2015 in New York City.
TAMPA, FL - DECEMBER 19: Demi Lovato attends the 2015 93.3 FLZ Jingle Ball at Amalie Arena on December 19, 2015 in Tampa, Florida. (Photo by Taylor Hill/FilmMagic)
MIAMI, FL - DECEMBER 18: Demi Lovato attends the 2015 Y100 Jingle Ball at BB&T Center on December 18, 2015 in Sunrise, Florida. (Photo by Taylor Hill/FilmMagic)
NEW YORK, NY - DECEMBER 11: Singer-songwriter Demi Lovato attends Billboard's 10th Annual Women In Music at Cipriani 42nd Street on December 11, 2015 in New York City. (Photo by Gilbert Carrasquillo/FilmMagic)
Recording artist Demi Lovato attends 2016 Glamour Women Of The Year Awards in Hollywood, California, on November 14, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Singer Demi Lovato performs at the 2016 Global Citizen Festival in Central Park to end extreme poverty by 2030 at Central Park on September 24, 2016 in New York City. / AFP / ANGELA WEISS (Photo credit should read ANGELA WEISS/AFP/Getty Images)
NEW YORK, NY - SEPTEMBER 24: Singer Demi Lovato attends the 2016 Global Citizen Festival In Central Park To End Extreme Poverty By 2030 at Central Park on September 24, 2016 in New York City. (Photo by Noam Galai/Getty Images for Global Citizen)
MIAMI BEACH, FL - DECEMBER 31: Demi Lovato performs onstage at Fontainebleau Miami Beach on December 31, 2017 in Miami Beach, Florida. (Photo by Rodrigo Varela/Getty Images for Fontainebleau Miami Beach)
PASO ROBLES, CA - JULY 22: Demi Lovato performs during the 2018 California Mid-State Fair on July 22, 2018 in Paso Robles, California. (Photo by C Flanigan/Getty Images)
US singer Demi Lovato performs on stage during the Rock in Rio Lisboa music festival at Bela Vista Park in Lisbon, on June 24, 2018. (Photo by MIGUEL RIOPA / AFP) (Photo credit should read MIGUEL RIOPA/AFP/Getty Images)
BILLBOARD MUSIC AWARDS -- Red Carpet Arrivals -- 2018 BBMA's at the MGM Grand, Las Vegas, Nevada -- Pictured: Demi Lovato -- (Photo by: Brian Friedman/NBC/NBCU Photo Bank via Getty Images)
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Those present at the house allegedly refused to provide any details about the drug that caused the overdose.

On Monday night, Lovato was celebrating the birthday of one of her backup dancers at a local bar/restaurant. She reportedly posted photos of the night out on her private Instagram. The account is separate from her official account, on which she rarely posts personal photos with friends.

Notably, just one day prior -- Sunday, July 22 -- Lovato had performed at the California Mid-State Fair in Paso Robles, where she claimed to forget a line from her song "Sober." The lyrics she missed are, "I promise I'll get help."

"F--k, I forgot the words," she instead said onstage.

Lovato's publicist said late Tuesday that she is "awake" but did not provide further details about her condition.

21 PHOTOS
Celebs react to Demi Lovato's overdose
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Celebs react to Demi Lovato's overdose
Sending lots of light and prayers to you baby girl @ddlovato ✨
This was exactly 10 yrs ago at S, Sweet 16. @ddlovato we love you. The world is a better place because of these infectious smiles. My heart hurts.
I love @DDLovato so much. It breaks my heart that she is going through this. She is a light in this world, and I am… https://t.co/fN8v58IAwm
Praying for you @ddlovato. You are loved. 🙏
Macklemore dedicated his song “Otherside” to Demi Lovato at his concert. #PrayForDemi https://t.co/f1rIEAtmrG
Like all of you I am reeling at the news about Demi. All of us love her and need to pray for her to get well. She is a fighter. #prayfordemi
Like all of you I am thinking of @DDLovato right now. She needs our prayers and support. We all know how strong you are Demi. #prayfordemi
My friend @ddlovato is one of the kindest, most talented people I’ve ever met. Praying for her right now, addiction… https://t.co/HEintp6ZNs
i love u @ddlovato
I love you @ddlovato and I’m praying for your strength and health.
sending huge recovery love to Demi. this is a very personal moment and respected delicately. all we can do is send… https://t.co/sm72VJmUgo
I don’t even know what to say except I’m thinking of you @ddlovato . 💜
Hang in there @ddlovato - sending good energy and love.
only love and support, save the rest 🌍. ❤️ @ddlovato
@ddlovato we love you 🙏🏻💗
praying for @ddlovato and her health. When I was 14, she was an idol to me in how she spoke so openly about mental… https://t.co/Atbd3lWDgB
My beautiful girl you are strong you always have been ❤️❤️
I’m praying for you with everything in me @ddlovato. You are so loved.
Dear @ddlovato you are a force to be reckoned with and stronger than you think. We’re all here for you ❤️
You’re a strong, talented, bright soul and you will overcome this. The world is on your side! Te abrazo a la distancia y se que te sobra fuerza y valentía para sobrepasar esta situación. Mis oraciones están contigo. Te quiero amiga🙏🏽
Charlie Puth gave his regards to Demi Lovato and dedicated his song “See You Again” at his concert tonight.… https://t.co/RlGsDawGWS
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