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Evolutionary psychological models have so far been unsatisfactory to explain subconscious mental dynamics like dreaming.A reason might be that applied evolutionary theories do not reflect the modern state of knowledge in evolutionary biology and paleontology, but rather refer to simplified Darwinian concepts of evolution.Another reason may be that isolated aspects of dreaming, like fear, or problem solving, instead of a holistic dream approach, are considered in an evolutionary context.This study focuses upon both aspects.A summary of the evolution of evolutionary theories is presented from Darwinian times onward, to recent.From this résumé, it is concluded that evolutionary processes can be characterized as essentially non-linear dynamic processes, which unpredictably influence biological units at different hierarchic levels: amino acids, genes, alleles, chromosomes, cells, organs, organisms, populations, species, biotopes and global ecosystems.In addition and analogous, a refined hierarchic dream model is proposed.This model considers dreams-as reported-as an amalgamation of a complex of hierarchically organized features.These features have evolved with different rates, different characteristics and different effects during phylogeny as well as ontogeny.A preliminary attempt is made to define 7 hierarchical, though interrelated classes of dream properties that constitute dreams: Memory, Causality, Sensory input, Emotional balancing, Cultural input, Individual input and Neoformation.The hierarchy of these properties in this order is reflected in their biological realms: from more or less universal to individual.This hierarchical structuring of dream features, each with their specific evolutionary history, may help to understand dreams in the context of evolutionary processes, and, in addition, to its relation with cultural and individual "speciation" processes and possibly other mental processes.