The hat man is a shadowy figure many people describe at the edge of sleep. Dream books read him as anxiety taking an outline, rather than as anything real in the room.
Where in your waking life have you met something like this lately?
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.