The notes allegedly show the King of Pop's bizarre state of mind before he died of drug addiction on June 25, reports the News of the World.
Pals of the singer believe Jackson was using the notes as means to prepare himself for his comeback concerts in London.
Note number one, found on the right of Jackson's gold-framed mirror, apparently read: "I am so grateful that I am a magnet for miracles."
Note number two, pinned to the bottom of the mirror, a message in large handwriting said: "Love, no violence ever!" And underneath, in smaller handwriting, he had added: "Remember a beautiful future promise of tomorrow."
Note number three was a startling reminder to perform the hit charity single he recorded with soul legend Lionel Ritchie in 1985, saying: "Do We Are The World in show".
Note number four read "Call Temperton", referring to British songwriter and producer Rod Temperton, who co-wrote several Jackson songs including Thriller and Rock With You.
A source said: "It's worrying that he had to write reminders about things as obvious as these while he was rehearsing for his tour... But the drugs he was taking obviously had a huge impact on his mind and memory."