No one is sure why we, or any other animal, dream. However, scientists have made significant progress in understanding the factors that influence sleep and dreaming.
It appears that the major difference in terms of the content of REM dreams versus non-REM dreams is that REM dreams involve more emotional, visual, and movement content.
During non-REM sleep, our dreams are often more static, involve older memories, or are quite emotionally charged. Our nightmares usually occur during non-REM sleep.
The presence of dreams during REM sleep, and the detection of physiologically similar states in other mammals, suggests that other animals experience dreaming.
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