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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.
During REM sleep our eyes twitch, our limbs and facial muscles may move and we dream. (You can read more specifics about sleep in our article How Sleep Works .). One sleep theory is that ouÂ­r brain goes over the information it received that day and decides what should stick around and where it should go. Think of your brain as a computer desktop. During the night, anything we learned that day is filed away in the proper folders, or moved to the recycle bin. Behavioral research supports this notion, but sleep is so mysterious and different for each person that it's tough to get conclusive results.