Dreams often involve sudden emotion reaction beacause they are triggered by random bursts of neural activity.
What is neural activity?
Neural activity is essential for shaping the nervous system's intricate circuits from initially imprecise neuronal connections. Many common neurodevelopmental disorders, ranging from subtle learning disorders to pervasive developmental delay, may be caused by disruptions in the formation of these precise circuits.
The central idea of activation-synthesis theory is that dreams are simply the brain's attempt to make sense of meaningless patterns of firing in the brain while we sleep. During REM sleep, certain brain circuits are activated.
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