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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.
By Mayo Clinic Staff. Polysomnography, also called a sleep study, is a test used to diagnose sleep disorders. Polysomnography records your brain waves, the oxygen level in your blood, heart rate and breathing, as well as eye and leg movements during the study. Polysomnography usually is done at a sleep disorders unit within a hospital or at a sleep center.