Short Answer
Somatic release after EMDR is common—your nervous system completes trauma responses that were interrupted during the original event. The shaking (neurogenic tremors) represents your body discharging stored survival energy. Post-EMDR shaking, crying, or fatigue indicates successful processing and integration. It's not dangerous; it's healing in action.
What This Means
Post-EMDR somatic responses vary: shaking or vibrating sensations, spontaneous crying, yawning, temperature changes (hot flashes or chills), and deep exhaustion. These occur hours to days after sessions, sometimes during. They can feel alarming if unexpected—you may worry something's wrong physically.
The shaking is particularly notable—often rhythmic, involuntary, starting in limbs or core. This is identical to the tremors seen in animals after life-threatening events. Gazelles shake after escaping lions; humans shake after processing stuck survival energy. Peter Levine's Somatic Experiencing calls this "completion of the defensive response."
Fatigue is also common—EMDR uses significant neurological resources. Your brain has been reprocessing memories, updating neural networks, shifting emotional charge. This is invisible work that consumes energy. Sleep often deepens and dreams may intensify as processing continues during REM.
Why This Happens
Trauma memories are often stored incompletely—your body prepared to fight, flee, or freeze but the threat ended before defensive responses completed. The energy remains trapped in the nervous system, creating hypervigilance and constriction. EMDR activates these memory networks; the bilateral stimulation helps process them; the incomplete defense responses finally discharge.
The mechanism involves the autonomic nervous system's sympathetic (activation) and parasympathetic (rest/digest) branches. Trauma keeps sympathetic chronically engaged. Successful processing allows parasympathetic to come online, often with tremor discharge—a sign the body is finally downshifting from emergency to baseline.
What Can Help
- Welcome the shakes: They're discharge, not damage. Allow gentle trembling without trying to stop it
- Warmth and rest: Your system needs recovery after processing—hot baths, blankets, early bedtimes
- Hydration and nutrition: Processing uses physical resources—support your body with food and water
- Gentle movement: Light walking or stretching supports integration; intense exercise may be too much
- Avoid alcohol: It interrupts the natural completion process and can retraumatize
- Journal: Capture insights and dreams—processing continues for days after sessions
- Contact your therapist: If somatic symptoms are extreme or distressing, your therapist can adjust pacing
When to Seek Support
While post-EMDR somatic responses are normal, severe reactions (vomiting, passing out, prolonged shaking) warrant checking with your therapist. Very occasionally, processing activates more material than expected, and titration (slower pace) may be needed. Generally, however, these somatic signs indicate successful trauma release—your body is finally completing what circumstances prevented at the time of trauma.
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Research References
Van der Kolk, B. (2014). The Body Keeps the Score. Viking. PubMed
Porges, S.W. (2011). The Polyvagal Theory. Norton. Google Scholar
Felitti, V.J. et al. (1998). Adverse Childhood Experiences. CDC ACE Study
American Psychological Association. (2023). Trauma
National Institute of Mental Health. (2023). PTSD