Maybe it was anxiety over his upcoming comeback concert series in London, England. Perhaps his body was trying to process too many different medications.

The reason may never be known, but a sworn affidavit makes clear that the King of Pop couldn't get rest the night before he died on June 25.

The affidavit, from Detective Orlando Martinez of the Los Angeles Police Department, outlines probable cause for search warrants on the offices of doctors who are thought to have treated Jackson.

Yet it also opens a window into Jackson's final hours, revealing information about the singer's treatment and the drugs given him by Dr. Conrad Murray, his personal physician, before his death. Watch a panel discuss Jackson's death »