Summary

Drastic or even life-threatening events can have lingering effects, like an echo. This is referred to as post-traumatic stress disorder (PTSD). The brain is unable to process these overwhelming experiences and stores the memories in such a way that they cannot be consciously controlled. They resurface again and again, including at night, when people with PTSD relive the trauma over and over until they wake up—usually in a state of panic.

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