Michael Jackson's inability to learn new dance moves and remember the lyrics to his songs were symptoms that the singer was totally sleep deprived by the time of his death, a sleep expert told a jury Friday.

Charles Czeisler said reports by workers on Jackson's ill-fated comeback concerts that the entertainer was losing weight, exhibiting signs of paranoia and his condition seemed to be deteriorating were consistent with someone who hadn't gotten any real sleep in a long time.

The sleep deprivation was likely caused by Jackson's use of the anesthetic propofol, which Czeisler said would put the singer in a drug-induced coma and not meet his body's need for actual sleep. Studies showed that similar levels of sleep deprivation resulted in the deaths of laboratory animals and would likely cause the death of a human, he said.

The extreme nature of Jackson's sleep deprivation would have shortened the singer's life unless he received appropriate treatment, Czeisler said. With proper treatment, Jackson could have continued to tour and perform for many years, he testified.

Czeisler relied heavily on summaries of testimony provided by a plaintiff's lawyer and emails from choreographers and others working on Jackson's "This Is It" tour to form his opinion. The testimony detailed Jackson's missed rehearsals and reports that he was picking up dance moves slowly, as well as that he requested a teleprompter to display lyrics to his songs.

"The meticulous detailing of his deterioration here was both profound and sad," Czeisler said.

The Harvard professor and sleep researcher is testifying as a sleep expert in a lawsuit filed by the singer's mother against concert promoter AEG Live LLC.

On cross-examination by AEG defense attorney Kathryn Cahan, the researcher acknowledged that he hadn't reviewed actual testimony from the case, including statements from AEG executives that they thought the singer appeared fine and had stellar rehearsals before his death.

Czeisler, who is being paid $950 an hour for his work on the case, said he reached his opinion after reviewing deposition transcripts, medical records and other evidence shown to jurors during Katherine Jackson's eight-week trial against AEG.

A lawyer for Katherine Jackson summarized the evidence used to form the basis for Czeisler's opinion in a 17-minute, 1,833 word question that caused the trial to grind to a halt on Thursday afternoon and Friday morning.

Michael Koskoff's inquiry was posed as a hypothetical question to Czeisler that included a summary of testimony, passages of emails already shown to jurors and other evidence presented during trial.

A judge said the question contained details that are inadmissible in the trial and misstated several other details. Superior Court Yvette Palazuelos opted not to strike the question from the record but allowed Koskoff to clarify it. That process took another 19 minutes on Friday.

Attorneys spent roughly an hour arguing over the structure of the lengthy question, leaving jurors waiting for nearly 30 minutes on Friday.

Czeisler earned more than $250 listening to the initial question, and more than $300 listening to Koskoff clarify it. Czeisler is a Harvard-educated sleep expert who has consulted on sleep issues for sports teams, the Rolling Stones, ex-NBA player Shaquille O'Neal and government agencies such as the CIA and U.S. Marshals Service.

In all, he estimated that he had spent 120 hours on the case, which would earn him $114,000.

Katherine Jackson's negligent hiring suit claims AEG Live is responsible for her son's death because it failed to properly investigate Conrad Murray, who was convicted of giving Jackson a fatal dose of propofol, and missed warning signs about his health.

AEG denies it hired Murray or could have known that the former cardiologist was giving Jackson propofol as a sleep aid.

___

Anthony McCartney can be reached at http://twitter.com/mccartneyAP

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  • 1968

    CIRCA 1968: R&B quintet 'Jackson 5' pose for a portrait in circa 1968. Clockwise from bottom left: Michael Jackson, Tito Jackson, Jackie Jackson, Jermaine Jackson, Marlon Jackson. (Photo by Michael Ochs Archives/Getty Images)

  • 1970

    CIRCA 1970: Pop singer Michael Jackson of the R&B quintet 'Jackson 5' performs onstage in circa 1970. (Photo by Michael Ochs Archives/Getty Images)

  • 1970

    CIRCA 1970: Pop singer Michael Jackson of the R&B quintet 'Jackson 5' poses for a portrait in circa 1970. (Photo by Michael Ochs Archives/Getty Images)

  • 1971

    DECEMBER 1971: Pop singer Michael Jackson of the R&B quintet 'Jackson 5' performs onstage wearing a bright patterned shirt in December 1971. (Photo by Michael Ochs Archives/Getty Images)

  • 1971

    LOS ANGELES - JUNE 1971: Pop singer Michael Jackson of the R&B quintet 'Jackson 5' poses for a portrait wearing a Mickey Mouse t-shirt in circa 1971. (Photo by Michael Ochs Archives/Getty Images)

  • 1972

    LOS ANGELES - APRIL 20: Michael Jackson poses for a photo shoot at his Hollywood Hills home on April 20, 1972 in Los Angeles California. (Photo by Michael Ochs Archives/Getty Images)

  • 1972

    Michael Jackson of the Jackson Five, portrait, London, November 1972. (Photo by Michael Putland/Getty Images)

  • 1973

    American singer Michael Jackson (1958 - 2009) on stage with the Jackson Five at the Inglewood Forum in California, 26th August 1973. (Photo by Michael Ochs Archives/Getty Images)

  • 1974

    American singer Michael Jackson (1958 - 2009) posing in New York in 1974. (Photo by Michael Putland/Getty Images)

  • 1975

    JAMAICA - MARCH 01: Photo of Michael JACKSON and JACKSON FIVE; Posed group portrait, full length L-R Tito, Jackie, Michael, Jermaine and Marlon Jackson (Photo by Fin Costello/Redferns)

  • 1976

    LOS ANGELES - SEPTEMBER 7: Pop singer Michael Jackson poses for a portrait session at home on September 7, 1976 in Los Angeles, California. (Photo by Michael Ochs Archives/Getty Images)

  • 1979

    1979: Pop singer Michael Jackson attends an event wearing a sequined shirt and a bow tie in 1979. (Photo by Michael Ochs Archives/Getty Images)

  • 1979

    NEW ORLEANS, UNITED STATES - OCTOBER 3: Michael Jackson performing on stage with The Jacksons on their Destiny Tour at the Municipal Auditorium on October 3,1979 in New Orleans, Louisiana. (Photo by Ebet Roberts/Redferns)

  • 1981

    American pop singer Michael Jackson carries the two American Music Awards he won for his album 'Off the Wall,' they are for Favorite Male Vocalist - Soul and R&B, and Favorite Album - Soul and R&B, Los Angeles, January 30, 1981. (Photo by Frank Edwards/Getty Images)

  • 1983

    1983: Portrait of American pop star Michael Jackson wearing a red leather jacket at the opening of the stage musical, 'Dream Girls,' Los Angeles, California. (Photo by Frank Edwards/Fotos International/Getty Images)

  • 1983

    LONDON -1983 : Michael Jackson at the BPI awards to collect an award on behalf of Barbra Streisand held in London 1983.(Photo by Dave Hogan/Getty Images)

  • 1984

    1984: Pop Star Michael Jackson performs onstage in 1984. (Photo by Michael Ochs Archives/Getty Images)

  • 1984

    11th Annual American Music Awards--Michael Jackson (Photo by Ron Galella/WireImage)

  • 1986

    The 14th Annual American Music Awards--Michael Jackson and Elizabeth Taylor (Photo by Barry King/WireImage)

  • 1988

    MN - 1988: Pop singer Michael Jackson performs onstage during his 'Bad World Tour' in 1988. (Photo by Jim Steinfeldt/Michael Ochs Archives/Getty Images)

  • 1990

    Michael Jackson (Photo by KMazur/WireImage)

  • 1993

    The 35th Annual GRAMMY Awards--Michael Jackson and Janet Jackson at the Shrine Auditorium in Los Angeles, California (Photo by Kevin Mazur/WireImage)

  • 1993

    Michael Jackson is Honored With Hollywood Walk of Fame (Photo by Jeff Kravitz/FilmMagic)

  • 1996

    AUCKLAND, NEW ZEALAND - NOVEMBER 10: Michael Jackson performs on stage during is 'HIStory' world tour concert at Ericsson Stadium November 10, 1996 in Auckland, New Zealand. (Photo by Phil Walter/Getty Images)

  • 1997

    "Happy Birthday, Elizabeth Taylor: A Celebration of Life"

  • 1999

    SUN CITY, SOUTH AFRICA - SEPTEMBER 5: Former South African President Nelson Mandela (L) claps his hands after American pop-icon Michael Jackson was given a lifetime achievement award during the Kora All Africa music awards in Sun City some 120 km northeast of Johannesburg , 04 September 1999. (Photo credit should read ADIL BRADLOW/AFP/Getty Images)

  • 2001

    The 16th Annual Rock and Roll Hall of Fame Induction Ceremony

  • 2001

    Michael Jackson Tribute Celebrating 30th Anniversary of His Solo Years

  • 2003

    The 3rd Annual BET Awards -Michael Jackson presents the Lifetime Achievement Award to James Brown (Photo by Steve Grayson/WireImage for BET Entertainment)

  • 2004

    WASHINGTON - MARCH 31: Singer Michael Jackson waves to fans after a meeting with Rep. Sheila Jackson Lee (D-TX) on March 31, 2004 on Capitol Hill in Washington, DC. Jackson was on Capitol Hill to meet with African-American lawmakers and offer his support on the fight against AIDS and help for African children. (Photo by Alex Wong/Getty Images)

  • 2005

    SANTA MARIA, CA - JUNE 3: Michael Jackson waves to fans as he arrives fo closing arguements in his child molestation trial at the Santa Barbara County Courthouse June 3, 2005 in Santa Maria, California. Jackson is charged in a 10-count indictment with molesting a boy, plying him with liquor and conspiring to commit child abduction, false imprisonment and extortion. (Photo by Frederick M. Brown/Getty Images)

  • 2006

    Michael Jackson during MTV Video Music Awards Japan 2006 - Press Room at Yoyogi National Stadium in Tokyo, Japan. (Photo by Nathan Shanahan/FilmMagic)

  • 2009

    LONDON - MARCH 05: Michael Jackson announces plans for Summer residency at the O2 Arena at a press conference held at the O2 Arena on March 5, 2009 in London, England. (Photo by Eamonn McCormack/WireImage)