Abstract
Purpose of Review
This paper describes a newly proposed sleep disorder, trauma-associated sleep disorder (TSD). Whether or not this represents a truly unique condition is controversial. In this paper, we describe the overlapping features and differences between TSD, post-traumatic stress disorder (PTSD), and rapid eye movement (REM) sleep behavior disorder (RBD).
Recent Findings
While REM sleep without atonia (RWA) and dream enactment are part of the diagnostic criteria for both RBD and TSD, only TSD features nightmares that occur both in non-REM and REM. A key difference between TSD and PTSD is the presence of symptoms during wakefulness in the latter, though the relationship between the two disorders is, as of yet, unclear. It is unknown whether or not a relationship exists between TSD and neurodegeneration; thus, this needs to be explored further.
Summary
Additional research, such as application of TSD diagnostic criteria to more diverse population, would help to determine whether or not TSD is a distinct clinical entity, its relationships to PTSD, as well as the association of this condition with the development of neurodegeneration.
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Introduction
During a critical juncture in Bram Stoker’s masterpiece Dracula, Professor Van Helsing begins to prepare for the upcoming battle with the infamous vampire. However, he insists that his colleague Mina, one of the novel’s more vulnerable characters, stays back by explaining “even if she be not harmed…she may suffer--both in waking, from her nerves, and in sleep, from her dreams” [1]. What Stoker is suggesting with this line, is that even without physical injury, the distress that accompanies a traumatic event can have severe psychological damage on an individual, which can manifest while he or she is asleep.
There is a wide breadth of literature describing various disruptive nocturnal behaviors (DNB) frequently reported after experiencing a traumatic event. The most common types of sleep disturbances are insomnia and nightmares [2], but other sleep abnormalities have also been reported such as severely fragmented sleep [3], early morning awakenings [4, 5], autonomic hyperarousal [6], sleep talking, and violently acting out of dreams [6, 7]. These types of parasomnias have been reported in other populations, but there is currently a debate on whether clinicians should adopt a newly proposed parasomnia specific to these trauma-associated sleep disturbances. Mysliwiec and colleagues have made a strong case for the newly defined parasomnia, aptly named trauma-associated sleep disorder (TSD); however, many of these symptoms overlap with other disorders, most notably posttraumatic stress disorder (PTSD) and rapid eye movement (REM) sleep behavior disorder (RBD) [6]. In this article, we review the current understanding, clinical characteristics, and pathophysiology of these disorders.
Differences Between RBD and TSD
Although violent reenactments of dreams while sleeping had been reported centuries ago, it was not formally diagnosed and named until the mid-1980s by Drs. Carlos Scheck and Mark Mahowald who coined the term RBD [8, 9]. In their initial report of four elderly men, they described extreme REM sleep pathologies including “variable loss of chin atonia, extraordinarily increased limb-twitch activity, and increased REM ocular activity and density.” These patients also exhibited coordinated limb motions while sleeping, including reaching and searching for nearby objects, punches, and kicks, as well as complex vocalizations. One of their most infamous patients used a nightly ritual in which he “tethered” himself to his bed’s headboard using a belt and rope to prevent himself from sporadically jumping out of bed, an improvised remedy he used for over 5 years prior to seeking professional treatment.
Although this clinical history of extreme dream enactment is characteristic of RBD, a patient can still be provisionally diagnosed with the disorder with or without REM without atonia (RWA), based upon clinical judgment and/or response, or lack thereof, to standard treatments for RBD [10, 11]. Selective serotonin re-uptake inhibitors (SSRIs) can contribute to RWA, but this does not preclude diagnosis of either RBD, secondary RBD, or TSD [6, 11].
Demographics
There seem to be key demographic differences between patients diagnosed with RBD and those proposed to have TSD.
Although TSD has not yet been extensively studied, in the majority of cases, patients have been young male adults, usually under the age of 40, and typically soldiers exposed to combat [4,5,6,7, 12]. RBD on the other hand is much more common in elderly men, usually 50 years or older, and is not associated with combat exposure or traumatic events [13]. Previous studies have shown that RBD can affect younger populations, but this anomaly is now recognized as small subgroup of RBD patients with different associated features and symptoms [14]. More recent data has shown that RBD may be diagnosed more equally between genders and in younger patients [15].
Although both disorders are more common in men, this could be due to diagnostic challenges and/or selection bias. In the original case series, over 85% of both the Schenk and Mahowald patients, and the Mayo Clinic patients, were reported as male [8, 9]. Similarly, most TSD cases are reported in soldiers, a predominantly male population. However, it is entirely possible that RBD and TSD may manifest in women as subclinical, nonviolent behaviors that do not flag the attention of medical providers [16].
Sleep Phenotype
Individuals with TSD are often diagnosed with other sleep disorders, most commonly insomnia and obstructive sleep apnea [6, 17]. It has been theorized that insomnia amplifies and perpetuates trauma-related nightmares in TSD through the decreased inhibition of the amygdala by the medial prefrontal cortex, which results from sleep deprivation [6].
RBD is also often comorbid with other sleep disorders, namely narcolepsy and periodic limb movements [13, 14]. RBD co-occurs more commonly in narcolepsy with cataplexy than narcolepsy without cataplexy [18]. There can be clinical confusion among the disorders; researchers recently described a new variant of periodic limb movement disorder that mimicked RBD and responded well to ropinirole [19]. Patients with RBD may have a milder severity of sleep apnea, possibly owing to increased muscle tone during REM sleep [20].
Nightmares are prevalent in TSD, and less so in RBD. Hefez and colleagues described a Holocaust survivor’s recurrent nightmare as “the same anxiety dream, in which he was haunted by his persecutors. This was a repetition of an actual traumatic experience he had at age 6, more than 39 years earlier.” This nightmare occurred both in REM and NREM sleep [4]. Dream content is also an important consideration when separating TSD from RBD. The dream content in TSD is often distressing and related to the traumatic event experienced by the individual, while in RBD, there are no specific criteria for dream content. Patients exhibiting both RBD and TSD will describe recurrent dreams, but only in TSD are they based around the reenactment of a traumatic event. Although RBD dreams are sometimes distressful or aversive, they can be mundane or even enjoyable [16, 21].
Waking Phenotype
TSD is not necessarily associated with daytime symptoms, the exception likely being its co-occurrence with daytime symptoms common in PTSD (i.e., hypervigilance, avoidance, re-experiencing the traumatic event) [6, 22, 23, 24••]. However, those with TSD do not necessarily have PTSD, and vice versa. Similarly, the symptoms of RBD are primarily isolated to sleep and not wakefulness. Daytime symptoms that do occur with RBD may be a manifestation of another neurodegenerative process, with which RBD may coincide. Both RBD and TSD may manifest with excessive daytime sleepiness due to sleep fragmentation.
PSG Findings
One of the most important distinguishing characteristics of TSD is that the trauma-related nightmares can occur in both REM and NREM sleep [24••, 25], which is not characteristic in other types of parasomnias. Nightmares that occur in NREM sleep may explain the variable level of recall that has been reported in patients with TSD [25, 26]. Both RBD and TSD are characterized by combative behaviors and complex vocalizations during REM, which can be a source of great distress, if not for the patient, then for his or her bed partner [23, 24••, 25].
PSG studies on individuals exhibiting TSD have demonstrated a hyperarousal of the sympathetic nervous system, including tachycardia, tachypnea, and night sweats [6, 23, 25]. All these symptoms suggest abnormal physiological arousal in the patients. Careful examination of the respiratory data from the PSG must confirm that the heightened arousal is not due to sleep-disordered breathing, which is a frequent comorbidity of TSD [6]. In contrast, there is evidence that there is a blunting or absence of REM-related cardiac and respiratory responses in subjects with idiopathic RBD [27, 28]. RBD can be an early sleep finding in patients with multiple system atrophy, which is characterized by autonomic dysfunction [29].
Relationship to Neurodegeneration
There is a strong link between RBD and degenerative brain diseases, including Parkinson’s disease [30], dementia with Lewy bodies [30, 31], and multiple system atrophy [29]. As of today, there is no clear connection between TSD and these neurodegenerative disorders. However, this could be due to the lack of longitudinal research on this proposed novel parasomnia.
Both RBD and TSD are partially defined by the presence of REM sleep without atonia (RWA), as well as by dream enactment behavior. The significance of RWA in isolation from other findings is not yet understood. RWA without dream enactment could be an early harbinger of neurodegeneration [32•]. Studies are underway in our laboratory to further investigate this question as well as whether there is a link between TSD and neurodegeneration.
Differences Between TSD and PTSD
Trauma-associated sleep disorder may be confused with PTSD due to the close temporal relationship with a traumatic event. In TSD, there is often a triggering event for sleep symptoms, as in PTSD [23, 25]. There is no such inciting event in RBD. Most TSD cases have been reported in veterans, a population in which PTSD is a common comorbidity, with the inciting event usually associated with some form of armed combat [7, 12, 33]. However, other traumatic events can also induce TSD and PTSD as seen in earthquake [34], sea disaster [4], and Holocaust survivors [4].
One of the required criteria for posttraumatic stress disorder (PTSD) is that the traumatic event is persistently re-experienced by the individual [22]. This is most commonly manifested in the form of nightmares. Several studies have shown the high incidence of PTSD patients experiencing nightmares [7, 35,36,37]. For instance, Neylan and colleagues found that over 52% of Vietnam veterans with PTSD experienced nightmares containing the reenactment of events from their time in the military. In comparison, only 5.7% of veterans without PTSD and 3.4% of civilians reported recurrent nightmares [38].
It is important to note that PTSD nightmares do not include dream enactment or REM without atonia (RWA), a core feature of TSD. Although previous studies have shown that individuals with PTSD may in fact exhibit violent behavior while experiencing a nightmare, such as thrashing and at times even attacking partners, this is not a requirement of the diagnosis and therefore constitutes as a separate sleep disorder [17, 39]. In TSD, dream enactment behavior is one of the primary criteria and a defining symptom of the disorder.
Another important distinction between TSD and PTSD is the lack of daytime symptoms. Individuals reporting TSD do not necessarily have any overt symptoms while awake, as seen in patients with PTSD, including alterations in cognition, mood, and arousal [22]. Although it is likely that TSD is often comorbid with PTSD, there have been reported cases of TSD without PTSD [6].
Treatment
Pharmacologic Therapy
Pharmacological therapy for RBD in the form of clonazepam and high-dose melatonin have been used with reasonable effectiveness [40,41,42,43,44,45,46]. While clonazepam treatment produces improvements in disruptive nocturnal behaviors in RBD, it does not restore REM atonia [47]. Interestingly, a small case series reported a reduction in the percentage of tonic REM activity in patients treated with melatonin, but no change in the percentage of phasic REM activity [41].
Pharmacological therapy for TSD is more limited. Prazosin has been a mainstay of treatment for nightmare disorders, including PTSD-associated nightmare disorder [48,49,50]. In a case series of four young male military veterans, therapy with prazosin improved both disruptive nocturnal behaviors and nightmares [6]. However, a recent large multisite clinical trial in veterans with PTSD and nightmare disorder showed no benefit of sleep symptoms with prazosin [51•]. Clonazepam has also been tried. While clonazepam did improve sleep onset and maintenance insomnia symptoms in a pilot study of patients with combat-related PTSD, it did not improve nightmares associated with combat-related PTSD [52]. Data is limited on the efficacy of other pharmacologic alternatives, such as synthetic cannibinoids [53], antidepressants, and antipsychotics, and anticonvulsants [54,55,56,57,58,59,60,61].
Non-pharmacologic Interventions
In RBD, PTSD, and likely TSD, it important to evaluate and treat any other concomitant sleep disorders, such as obstructive sleep apnea and insomnia. It is also critical to optimize sleep hygiene, which includes keeping a regular lights off/lights on schedule, as well as to ensure adequate sleep opportunity.
There are several non-pharmacologic options for treatment PTSD-associated nightmare disorder, including image rehearsal therapy (IRT); exposure, relaxation, and re-scripting therapy (ERRT); lucid dreaming therapy; systematic desensitization and exposure therapy [36, 54, 58, 62]. IRT and ERRT have been studied extensively and are well-established, but data supporting the use of the other aforementioned therapies are limited [62,63,64]. Cognitive behavioral therapy for insomnia has been shown to improve sleep in patients with PTSD-associated nightmare disorder, but effects on nightmare frequency and severity have been variable [65,66,67]. However, no non-pharmacological interventions have been specifically studied in TSD or RBD.
Conclusions
While trauma-associated sleep disorder is characterized by a unique set of features, there is a great deal of overlap of these features with those of other disorders, such as REM sleep behavior disorder and posttraumatic stress disorder. Dream enactment behavior and REM without atonia are part of the diagnoses of both RBD and TSD. The relationship between TSD and PTSD remains unclear, but both can be associated with nightmares. Larger scale, longitudinal studies are needed to evaluate the full spectrum of TSD and whether this is a distinct sleep disorder with long-term neurological consequences, like RBD.
At the Portland VA, we have established a large data repository of over 600 veterans with polysomnography along with questionnaires on PTSD, traumatic brain injury, medications, and dream enactment behavior. Polysomnography data will be reviewed to identify REM without atonia, disruptive nocturnal behaviors captured on video, and tachycardia on EKG. Veterans will be followed prospectively for evidence of neurodegenerative disease. Future directions should expand to civilian populations, as well as in women, adolescents, and children—such work would provide support of TSD as a distinct, generalizable clinical sleep disorder.
Take-Home Points
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Trauma-associated sleep disorder (TSD) has been recently proposed to be a unique sleep disorder based upon initial studies in military veteran populations by Mysliwiec and colleagues.
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While there is some overlap between TSD and REM sleep behavior disorder, there are a few key differences, such as the presence of a triggering traumatic event and nightmares.
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While there is some overlap between TSD and posttraumatic stress disorder, there are a few key differences, such as lack of daytime symptoms.
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Much research remains to be done on TSD for it to be validated as a unique clinical entity, such as application of diagnostic criteria to more diverse populations, treatment of the disorder, and its possible relationship to neurodegeneration.
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Acknowledgements
The authors would like to express their sincere appreciation and gratitude for the participation of all subjects, to the staff at the VA Portland Health Care System Sleep Disorders Clinic, and to Dennis Pleshakov, Jonathan Elliott, Ryan Opel, and Kris Weymann for assistance with subject recruitment and RWA data collection.
Funding Sources
This material is the result of work supported with resources and the use of facilities at the VA Portland Health Care System, VA Career Development Award #IK2 BX002712, NIH EXITO Institutional Core, # UL1GM118964, and the Portland VA Research Foundation to M.M.L.; and DoD # PT160162 to M.M.L. and N.M.B. The contents do not represent the views of the U.S. Department of Veterans Affairs or the United States Government.
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Tara D. Rachakonda, Nadir M. Balba, and Miranda M. Lim have no financial or other conflicts of interest to disclose.
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Rachakonda, T.D., Balba, N.M. & Lim, M.M. Trauma-Associated Sleep Disturbances: a Distinct Sleep Disorder?. Curr Sleep Medicine Rep 4, 143–148 (2018). https://doi.org/10.1007/s40675-018-0119-2
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DOI: https://doi.org/10.1007/s40675-018-0119-2