Shadow

C. G. Jung described Shadow as the unconscious part of human personality the Ego doesn't want to recognise as part of himself, even of it's probably the most important part of ourself.

Shadow usually manifest herself at night, in dreams, and in behaviors called projections (I summarise what projection is in my first publication). Personally I often "feel" her when I have some imperceptible thoughts during my daily activities, and knowing myself better thanks to a psychologist is helping me to talk and understand my unconscious mind.