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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.
Sleep is the regular state of natural rest observed in all mammals, birds and fish. Sleep is not actually  unconsciousness , but rather, it is a natural state of rest characterized by a reduction in voluntary body movement and decreased awareness of the surroundings. Stage 5, or Rapid eye movement (REM) sleep, associated with dreaming, especially bizarre, visual, and seemingly random dreams. 2  REM sleep is predominant in the final third of a sleep period, its timing linked to circadian rhythm and body temperature.