Some people become sleepy after a trigger because the nervous system becomes overwhelmed. One response to overwhelm is hypoarousal, in which the system begins to shut down. Numbness is one way this can show up, and sleepiness is another. Feelings of fatigue and heaviness can also be part of this response.
These responses developed as survival defenses in situations where fighting or fleeing was not possible. They created distance between the overwhelming experience and your nervous system. The trigger may be connected to something current, or to thoughts, emotions, or memories from the past.
Today, this response can feel frustrating, especially when you have tasks that need your attention. Feeling like you need to sleep may not help in those moments. However, when you had fewer ways to protect yourself, this was one way your system reduced the intensity of overwhelming situations.
This page is part of the Why Do Trauma Responses Show Up Even When You Know You’re Safe section of the CommuniDID site, which explains why the nervous system continues protective responses long after the original threat has passed.
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