I tried this to look into my past lives and it worked but is can be very confusing. Lay down and get ready to dream. Recite this aloud before going to sleep.
“Spirits that give the sight of yore,
show me my past lives of long before.”
I have done this for 2 night in a row and received from very vivid but confusing dreams. The main thing about these dreams is that they are almost identical and the longer I stay asleep the more in depth they become.