If a ghost - i.e. a shadowy shape - appears in a dream we may be alerted to our past states of being and ways of behaviour. We need to identify these and acknowledge that we have moved on. We may be resurrecting old memories or feelings in order to understand our own actions. By putting ourselves in touch with what is dead and gone we can take appropriate action in the here and now. If we dream of being haunted by a ghost we have probably not handled an emotional trauma well. Actually dreaming of a ghost links us to old habit patterns, or buried hopes and longings. There is something insubstantial in these, possibly because we have not put enough energy into them. You might like to consult the entry for Spirit for further information.