Last week, sources close to Jackson said the insomniac singer traveled with an anesthesiologist who would "take him down" at night and "bring him back up" during the "HIStory" world tour in the mid-1990s.

CNN: More associates link Jackson to prescription drugs

Sources close to Jackson told CNN that the insomniac singer traveled with an anesthesiologist who would "take him down" at night and "bring him back up" during a world tour in the mid-90s.

CNN: Portrait of Jackson's pill consumption emerges