Approximately 70 percent of people worldwide will experience at least one potentially traumatic event during their lifetime.
Clinically, a traumatic event is defined as exposure to actual or threatened death, serious injury, or sexual violence, whether experienced directly, witnessed firsthand, or learned about as something that happened to someone close.
But trauma also encompasses a broader range of experiences: the chronic erosion of safety in an abusive relationship, the helplessness of a prolonged medical crisis, the accumulated weight of repeated neglect.
Among the most disruptive and least discussed effects is what trauma does to sleep.
People who have experienced trauma report significantly higher rates of insomnia, recurrent nightmares, fragmented sleep, and a persistent inability to feel safe enough to rest.
The Neurological Impact of Trauma
When a person experiences trauma, it becomes embedded in the nervous system in ways that alter how the brain regulates emotion and interprets safety on an ongoing basis.
In many cases, trauma leaves lasting functional and structural changes across several interconnected regions of the brain, each of which shapes how a person thinks, feels, and ultimately, how they sleep.
Following trauma, the amygdala, the brain's threat-detection system, becomes hyperreactive, responding with disproportionate alarm to stimuli that merely resemble the original threat.
The prefrontal cortex, responsible for rational appraisal and emotional regulation, exhibits decreased activity, weakening its ability to signal that the current moment is safe.
Memory is affected as well, as the hippocampus, responsible for contextualizing memory in time and place, is often compromised, and traumatic memories as a result do not behave like ordinary ones.
The consequence of all of this is a nervous system that cannot fully distinguish past from present, that remains in a state of partial or full hyperarousal long after the danger has ended, and that struggles to regulate the very emotional processes that sleep depends upon.
The Effect of Trauma on Sleep
Sleep disturbance is among the most prevalent and most debilitating consequences of trauma. Research consistently places it at the very center of post-traumatic pathology, not as a secondary symptom but as a hallmark one.
Studies have found that upwards of 90 percent of individuals diagnosed with PTSD report some form of sleep problem:
Insomnia
Approximately 70 percent of individuals with a PTSD diagnosis report clinically significant difficulty initiating sleep, maintaining it, or returning to sleep after waking.
The mechanism is rooted in hyperarousal: the traumatized nervous system, unable to fully disengage its threat-detection systems, resists the physiological quieting that sleep requires
The body, in effect, interprets the vulnerability of sleep as a form of danger.
Parasomnias
Parasomnias are a category of sleep disorders defined by abnormal behaviors or experiences during sleep, and they occur at significantly elevated rates in trauma-exposed populations.
The most common is recurrent nightmares, affecting an estimated 50 to 70 percent of people with PTSD, with some studies reporting average nightmare frequency exceeding five nights per week.
Trauma-related nightmares often replay the content of the original event, or present thematically related scenarios of helplessness and threat, producing the same physiological stress response as the event itself: elevated heart rate, rapid breathing, and full waking.
Nightmares, however, are not the only parasomnia associated with trauma. REM sleep behavior disorder, in which the normal muscle paralysis that accompanies REM sleep is absent, allows individuals to physically act out their dreams. Studies of veterans have placed the rate of this disorder at approximately 21 percent among those with both PTSD and traumatic brain injury.
How to Improve Sleep After Trauma
There is no single intervention that resolves the impact of trauma on sleep. What the research supports is an approach that addresses the sleep problems directly while also engaging with the underlying trauma, recognizing that both require attention and that treating one in isolation is less effective than addressing both in concert.
Cognitive Behavioral Therapy for Insomnia (CBT-I)
Cognitive behavioral therapy for insomnia, commonly referred to as CBT-I, is the most rigorously supported first-line treatment for insomnia, including insomnia arising in the context of trauma and PTSD.
Unlike sleep medication, which addresses symptoms without changing the underlying cognitive and behavioral patterns that sustain insomnia, CBT-I works by identifying and restructuring the thoughts, behaviors, and physiological responses that keep sleep out of reach.
In trauma-exposed populations, CBT-I has been shown to produce meaningful improvements in sleep independent of changes in broader PTSD symptomatology, meaning it can help even when the underlying trauma is still being processed.
Optimizing the Sleep Environment
For trauma survivors, the sleep environment can actively support or undermine recovery.
Because the nervous system has learned to treat nighttime and the bedroom as extensions of the threat itself, the physical conditions in which sleep is attempted carry more weight than they would for someone without that history.
Ensuring the room is dark, cool, and quiet, and establishing a consistent pre-sleep routine can gradually help recondition a nervous system that has come to associate the bedroom with danger rather than rest.
Consistency in sleep and wake times supports circadian rhythm stability, which trauma can disrupt through HPA axis dysregulation.
Scent Support
Of all the sensory pathways available to the brain, smell is the only one that bypasses the thalamus and connects directly to the limbic system, the region that governs emotion, memory, and the body's sense of safety.
A study published in 2024 established a neurobiological basis for using aromatherapy to address sleep disorders, finding that lavender essential oil promotes sleep through the olfactory pathway and GABA neuronal targets in the central amygdala.
Kimba is a first-of-its-kind adaptive scent sleep system built specifically around this mechanism. Rather than sedating or chemically overriding the brain's activity, it works by calming the part of the brain that determines whether rest is possible in the first place.
Kimba was developed out of direct experience with exactly this problem. Its founder, Ben Fuxbruner, developed the system after struggling with PTSD, nightmares, and insomnia following a traumatic injury.
What began as a personal exploration of scent as a tool for sleep became a clinically validated system, validated by sleep scientist Professor Peretz Lavie and neurobiologist Dr. Anat Arzi, with ongoing clinical trials at leading research institutions.
For those whose sleep has been shaped by trauma, the path to recovery is not easy, but the science is increasingly clear that the brain retains the capacity to find its way back to rest, and that the tools available to support that process are more sophisticated than they have ever been.
Sources
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World Health Organization
https://www.who.int/news-room/fact-sheets/detail/post-traumatic-stress-disorder -
World Mental Health Surveys (Benjet et al., 2016)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5632781/ -
Anne Germain (2013). Sleep disturbances as the hallmark of PTSD
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3549469/ -
National Center for PTSD
https://www.ptsd.va.gov/professional/treat/cooccurring/sleep_problems_vets.asp -
Barry Krakow et al. Imagery Rehearsal Therapy for Chronic Nightmares
https://pubmed.ncbi.nlm.nih.gov/11322718/ -
Peretz Lavie & Anat Arzi (olfactory and sleep research)
https://pubmed.ncbi.nlm.nih.gov/31451641/
