The bogeyman is the shapeless fear of childhood, and dream tradition reads it as anxiety that has no clear face. Seeing it again in adulthood is taken as an old, vague worry asking to be given a name.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.