Dreams and exposure therapy in PTSD

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  • Journal of Traumatic Stress, Vol. 14. No. 3, 2001

    Dreams and Exposure Therapy in PTSD

    Barbara Olasov Rothbaum'*' and Thomas Alan Mellman2

    Exposure therapy is a well-established treatment for PTSD that requires the patient to focus on and describe the details of a traumatic experience. Nightmares that refer to or replicate traumatic experiences are prominent and distressing symptoms of PTSD and appear to exacerbate the disorder: With this apparent paradox in mind, exposure therapy and the literature on sleep and PTSD are reviewed in the context of the relationship between therapeutic exposure and exposure to trauma- related stimuli that occurs in dreams. It is concluded that nightmares that replay the trauma and disrupt sleep do not meet requirements for therapeutic exposure, whereas other dreaming may aid in the recovery from trauma. KEY WORDS: PTSD exposure therapy; dreams; sleep; REM sleep; trauma.

    Are dreams following a traumatic event a form of therapeutic exposure? In individuals recently traumatized, can dreams function as a form of working

    through the trauma and decrease posttraumatic stress disorder symptoms? In PTSD sufferers, why do their dreams of the incident appear to exacerbate their

    symptoms?

    These are the questions that prompted this discussion paper. F'TSD sufferers have no refuge: they feel haunted by their experiences day and night. By day, they often experience intrusive recollections, anxiety, and may feel danger is lurking around every comer (Rothbaum, Foa, Riggs, Murdock, & Walsh, 1992). Rather than being able to take solace in a good night's sleep in the comfort of their own bed, they are often haunted by their dreams, coming to fear the nighttime for the vulnerability they fear in the dark with their eyes open or shut (Foa & Rothbaum,

    'Department of Psychiatry and Behavioral Sciences. Emory University School of Medicine, Atlanta, Georgia.

    'Department of Psychiatry, Dartmouth Medical School, Lebanon, New Hampshire. 'To whom correspondence should be addressed at Department of Psychiatry and Behavioral Sciences, The Emory Clinic, I365 Clifton Road, Atlanta, Georgia 30322; e-mail: brothba@emory.edu.

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    08W-9867x)1/0700W81519.HyI 0 2001 Inkmotional Society for Tmvmvic SIP%= Studies

  • 482 Rothbaum and Mellman

    1998; Neylan et al., 1998). How can we, as mental health professionals, help them to achieve recovery that includes a restful nights sleep? Herein, exposure therapy, sleep, and dreaming as they apply to PTSD will be briefly reviewed, and relationships between exposure to trauma-related stimuli in dreams and nightmares and therapeutic exposure will be explored.

    A brief overview of exposure therapy is presented here. The reader is referred to Foa and Rothbaum (1998) for an extensive discussion of exposure therapy for PTSD or to Rothbaum and Foa (1999) for a brief overview of the research on exposure therapy for PTSD.

    Exposure Therapy

    A variety of terms have been used to describe prolonged exposure to anxiety- provoking stimuli. These include Flooding/ImaginalAn Vivo/Prolonged/Directed; in this paper, these are referred to collectively as exposure. Exposure methods share the common feature of confrontation with frightening, yet realistically safe, stimuli that continues until the anxiety is reduced. By continuing to expose oneself to a safe yet frightening stimulus, anxiety diminishes, leading to a decrease in escape and avoidance behavior that was maintained via negative reinforcement (Mowrer, 1960).

    In imaginal exposure for PTSD, patients confront their memories of the trau- matic event. Some imaginal methods (e.g., Foa. Rothbaum, Riggs, & Murdock, 1991; Foa & Rothbaum, 1998) involve the patients discussing the trauma in detail in the present tense for prolonged periods of time (e.g., 45-60 min), with prompt- ing by the therapist for any omitted details. Other forms of imaginal exposure (e.g., Cooper & Clurn, 1989; Keane, Fairbank, Caddell, & Zimering, 1989) involve the therapists presenting a scene to the patient based on information gathered prior to the exposure exercise. The duration and number of exposure sessions have also var- ied, sometimes within the same study. Details on the implementation of exposure for PTSD have been provided in Foa and Rothbaum (1998).

    It has been suggested that PTSD emerges due to the development of a fear network in memory, which elicits escape and avoidance behavior (Foa, Steketee, & Rothbaum, 1989). Mental fear structures include stimuli, responses, and meaning elements. Anything associated with the trauma may activate the fear structure. The fear network in people with PTSD is thought to be stable and broadly generalized so that it is easily accessed. Emotional processing theory (Foa & Kozak, 1986) proposes that successful therapy involves correcting the pathological elements of the fear structure, and that this corrective process is the essence of emotional pro- cessing. Two conditions have been proposed to be required for fear reduction. First, the fear structure must be activated. Second, new infomation must be pro- vided that includes elements incompatible with the existing pathological elements so they can be corrected. Exposure procedures consist of confronting the patient

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    with trauma related information, thus activating the trauma memory, and keeping the patient exposed to the memory for a prolonged period of time. This prolonged activation allows any corrective information to be integrated, and thus modify the pathological elements of the trauma memory. In support of this model is a study demonstrating that fear activation during treatment promotes successful outcome (Foa, Riggs, Massie, & Yarczower, 1995).

    Several mechanisms are thought to be involved in the specific changes rel- evant to improvement of PTSD. First, repeated imaginal reliving of the trauma is thought to promote habituation and thus reduce anxiety previously associated with the trauma memory and correct the erroneous idea that anxiety stays forever unless avoidance or escape is realized. Second, the process of deliberately con- fronting the feared memory blocks negative reinforcement connected with the fear reduction following cognitive avoidance of trauma related thoughts and feelings. Third, reliving the trauma in a therapeutic, supportive setting incorporates safety information into the trauma memory, thereby helping the patient to realize that re- membering the trauma is not dangerous. Fourth, focusing on the trauma memory for a prolonged period helps the patient to differentiate the trauma event from other nontraumatic events, thereby rendering the trauma as a specific occurrence rather than as a representation of a dangerous world and of an incompetent self. Fifth, the process of imaginal reliving helps change the meaning of FTSD symptoms from a sign of personal incompetence to a sign of mastery and courage. Sixth, prolonged, repeated reliving of the traumatic event affords the opportunity for focusing on de- tails central to negative evaluations of themselves and modifying those evaluations (Foa & Rothbaum, 1998).

    Therapeutic exposure requires long, repeated exposures that allow for the mechanisms listed earlier to be enacted. The simplest and most straightforward mechanism is probably habituation, which describes decreased responding to the same stimulus when it is presented repeatedly over time. Short exposures may further sensitize, actually making the fear worse. For example, consider a child who is fearful of dogs following a dog bite. A typical in vivo (in real life) exposure program might involve the child first being exposed to small fluffy nonthreatening dogs at a distance, but remaining in that situation long enough for her fear to decrease, allowing time for the child to see the animal poses no threat to her. Exposure would continue by increasing the size of the dog, decreasing the distance from the dog, and increasing the similarity to the appearance of the dog that bit her. In all cases, she must be allowed to stay near the animal until her fear decreases to recognize that the animal poses no threat to her. If she is exposed to a dog, experiences fear, and the dog is removed while she still feels fear, her fear would be expected to be strengthened. She would not be able to convince her body that she did not narrowly escape another attack. Her body would respond with fear in the presence of the dog and would experience relief upon the removal of the dog. This is not a therapeutic exposure.

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    Now we present a brief overview of normal sleep with attention to REM sleep and dreaming, and observations that have been made in relation to PTSD.

    Normal Sleep

    There have been considerable advances in the understanding of the mecha- nisms and function of sleep. However, certain key questions remain unresolved. Advancing knowledge and continuing uncertainty particularly apply to under- standing of the nature and function of rapid eye movement or REM sleep, the active stage of sleep that is most specifically associated with dreaming. Many current insights into sleep, including the discovery of REM sleep approximately 50 years ago, have come from the application of electroencephalographic or EEG recording, the method for measuring elecmcal activity of the brain. Modem tech- niques for obtaining EEG and other physiological data during sleep are referred to as polysomnography or PSG.

    During normal sleep, arousal continues to diminish after sleep is initiated, and this process is indexed by EEG waves that gradually exhibit slower oscillation and higher voltage (slow wave sleep). After a 1-2 hr period of deepening non-REM sleep, cortical arousal increases, her