In Jewis-Christian-Islamic traditions Satan was represented by a horned fertility god, a personification of the fertilizing power of nature. In psychological terms, a fertilizing agent is something within the psyche that can inaugurate a new phase in the individual's development. It also may represent the repressed contents in the unconscious that can lead one to a fuller and balanced life.

From SpiritCommunity

Devil Dreaming about devils and demons is usually very frightening and you may awake from fear. The devil does not generally represent something outside of yourself. It usually symbolizes the most negative and least developed part of you. It may be that part of you that is ignorant and destructive. You can determine the meaning and message in your dream by looking at all of the details carefully. All dreams are good dreams in that they bring unconscious materials to the conscious mind. Only then can you begin to effectively cope with the more unpleasant sides of your personality. Carl Jung called this negative side the 'shadow." The devils in your dreams could be representations of your personal shadow or they could be a glance at the collective shadow.

Dreaming of hell indicates that you may be suffering from a seemingly inescapable situation. You may have placed your decision or course of action into someone else's hand. Alternatively, you may be possessing many inner fears and repressed guilty feelings. It is time to quit punishing yourself and take it easy for awhile.

Demons in dreams probably represent parts of your unconscious mind that have been repressed and neglected and are now threatening to disrupt or mutilate the psyche. They should be approached lovingly, given attention and integrated into your conscious life. This will bring about their "conversion": They will cease to threaten and will contribute their vital energies to the enhancement of the self.

Self-knowledge - knowing what we are carrying around with us in our unconscious - is the only sure defence against what in ancient times was called demonic possession, which in psychological terms means the conscious ego being taken over by unconscious forces {obsessive fear or anger, or whatever}.

Reference: Eric Ackroyd

Devil

Basic Meaning - A fear of those repressed contents of the unconscious that are, when acknowledged the very forces that could bestow a harmonious and balanced life.

(1) The Satan of Jewish - Christian - Islamic tradition was originally a horned fertility god, a personification of the fertilizing power of Nature {the tradition of God is separate from Nature}. In psychological terms, a fertilizing agent is something within the psyche that can inaugurate a new phase in the individual's development.

(2) The evil connotations of the devil figure may reflect the dreamer's fear of those repressed contents of the unconscious that are, in fact, the very forces that - if mobilized and utilized - could bestow a new and fuller life. What we repress is invariably something that had great value for us but on some occasion in the past gave rise to guilt-feelings or a fear of punishment. It is our fears that invest the unconscious with the fearsome characteristics of a dark underworld inhabited by evil monsters. In reality, the unconscious contains all the energy and wisdom we need for healing and wholeness.

It might be said that our fundamental human task is the conversion of the devil within ourselves, that is, converting negatively charged {dissident, destructive} psychic forces into positively charged {life-enhancing and unifying} powers. But you won't convert the devil with brute force, only with love. The negatively charged psychic forces are the ones you neglect and despise or fear. They become positively charged when you acknowledge them and integrate them into your conscious life.

If we do not recognize the "devil" within ourselves, we shall project him onto others and thereby give more scope for hatred and destruction {the real devil!} in the world.

{3} In certain contexts - if, for example, he has horns or is sexually involved with naked women - the devil may be a sexual symbol. If sexuality is repressed in such a guise in a woman's dream, it is possibly because she has a fear of sexual relations. In a man's dreamthe indication might be that he has a guilt-ridden attitude towards his own sexuality {which Freud might trace back to anxiety arising out of the normal male infant's erotic feelings for his mother}.

Demons

Demons in dreams probably represent parts of your unconscious mind that have been repressed and neglected and are now threatening to disrupt or mutilate the psyche. They should be approached lovingly, given attention and integrated into your conscious life. This will bring about their "conversion": They will cease to threaten and will contribute their vital energies to the enhancement of the self.

Self-knowledge - knowing what we are carrying around with us in our unconscious - is the only sure defence against what in ancient times was called demonic possession, which in psychological terms means the conscious ego being taken over by unconscious forces {obsessive fear or anger, or whatever}.

Reference: Eric Ackroyd

Dragon:

Animal instincts to be conquered, hence the battles of Saint George and Saint Michael with 'the dragon." The dragon fight is related to the archetypal themes of search/quest, the hero/heroine, and, in more modern terms, separating ourselves from the collective values of our parents/ancestors. The dragon can symbolize a guardian or guarding quality; something that needs to be guarded/protected in your life/psyche. As a devouring creature, it may represent negative aspects of the mother archetype. It shares much of the same symbolism as the snake, and both can symbolize the developing Self

Pagan/Wiccan Interpretation of Dragon {Positive}

Witches are priestesses of Earth Mother and they are popularly seen as malevolent {wishing evil or harm to others}.This popular view, perpetuated by those children writers and teachers who know nothing of the history of witches, derives from the Christian persecution of witches as devil-worshipers, which in turn derived from Christian tendency to separate God from nature and to worship a transcendent {sky-} god rather than an indwelling {earth-}goddess. A witch in dreams may therefore represent either the possibilities below. An internal source of wisdom, healing and growth.

Alternatively, a witch may be a destructive unconscious force: for example, a repressed part of yourself. In a man's dreama witch may symbolize the negative aspect of the anima. Do you suffer from moodiness and a conviction that nothing can ever come right for you? This may be because you feel in some way let down by your mother. 'the character pf a mansanima is as a rule shaped by his mother".