The Michael Jackson wrongful death trial continued this week with testimony from defense witnessses who told the jury that the king of pop had asked them for propofol to use as a sleeping aid, reports the AP.

Dr. Christine Quinn said MJ asked her as long ago as 1998 or 1999, and she refused. “I told him that the sleep you get with anesthesia is not real sleep, not restful sleep,” she said.

Cherilyn Lee, a nurse practitioner, testified that Jackson made the same request in April 2009. “His demeanor was, ‘I have to have this. I have to have this to sleep. You don’t understand, I have not had a good night’s sleep,'” she said.

Lee also refused, warning him that he might not wake up if he used it at home, He insisted, she said, saying that he could be monitored.

Jackson died in June 2009 from a propofol overdose. He was given the drug in his home by Dr. Conrad Murray, who was convicted in 2011 of involuntary manslaughter for MJ’s death.

The defendant, This Is It concert promoter AEG Live, was brought to trial by Katherine Jackson, MJ’s mother, on behalf of his three children.