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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 Shelby Freedman Harris, Psy.D. for YouBeauty.com. Sleep talking (also know as somniloquy) is a sleep disorder that involves unconscious talking when you're asleep. The presentation can vary greatly between people, with some spontaneously talking while others notice it happens when someone talks to them in their sleep.