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Sleep psychology is a specialty that developed from the need to better understand and treat sleep and sleepârelated disorders. The specialty requires a broad understanding of: 1  Normal and disordered sleep. 2  Sleep physiology.3  The effects of sleep medications on the brain.4  Sleep cycles.5  Sleep changes related to age.leep psychology is a specialty that developed from the need to better understand and treat sleep and sleepârelated disorders. The specialty requires a broad understanding of: 1  Normal and disordered sleep. 2  Sleep physiology. 3  The effects of sleep medications on the brain. 4  Sleep cycles. 5  Sleep changes related to age.
Perceptual psychology is a subfield of cognitive psychology that is concerned specifically with the pre-conscious innate aspects of the human cognitive system: perception.Perceptual psychology is a branch of cognitive psychology dealing with mental processes that we use in everyday living.Any time you problem-solve, make a decision or make a memory you are using an example of perceptual psychology.erceptual psychology is a branch of cognitive psychology dealing with mental processes that we use in everyday living. Any time you problem-solve, make a decision or make a memory you are using an example of perceptual psychology.