What does it mean when you dream you lost your memory?

The dream would have different meaning depending on your particular circumstances. For an older person, the dream could express anxiety about actual memory loss or simply the fear of developing Altzheimer's or some other form of dementia. Alternatively, you may have reason to suspect that you have repressed disturbing memories of your childhood or early life. Yet again, it could merely reflect a television drama or a science fiction film that made a strong impression on your imagination.