 Although more research needs to be done on this subject, dreams are said to be linked to the unconscious mind.Thought suppression has an influence on the subject matter of the unconscious mind and by trying to restrain particular thoughts, there is a high chance of them showing up in one's dreams.Ironic control theory, also known as "ironic process theory", states that thought suppression "leads to an increased occurrence of the suppressed content in waking states".