Dreaming is not an adaptation

Behavioral and Brain Sciences 23 (6):936-939 (2000)
Abstract
The five papers in this issue all deal with the proper evolutionary function of sleep and dreams, these being different. To establish that some trait of character is an adaptation in the strict biological sense requires a story about the fitness enhancing function it served when it evolved and possibly a story of how the maintenance of this function is fitness enhancing now. My aim is to evaluate the proposals put forward in these papers. My conclusion is that although sleep is almost certainly an adaptation, dreaming is not. [Hobson et al.; Nielsen; revonsuo; Solms; Vertes & Eastman].
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Katja Valli (2011). Dreaming in the Multilevel Framework. Consciousness and Cognition 20 (4):1084-1090.
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