6.5 Dissociation and Sleep

Researchers, notably Watson (2001), propose that dissociative symptoms (absorption, derealization, depersonalization) originate from sleep.
This idea has deep historical roots.
Historical context:
- In the 19th century, the concept of double consciousness (dédoublement) was prevalent, which is historically linked to dissociative identity disorder (DID), previously referred to as multiple personality disorder.
- It was often described as "somnambulism," implying a state of sleepwalking; patients were referred to as "somnambules" (Hacking, 1995).

Many scholars believed in the oscillation between a "normal state" and a "somnambulistic state" in affected individuals.
Hughling Jackson, an English neurologist, theorized that dissociation involved an uncoupling of normal consciousness, resulting in what he termed "the dreamy state" (Meares, 1999).
Levitan (1967): suggested that "depersonalization is a compromise state between dreaming and waking" (p.157).
Arlow (1966): noted the dissociation between the "experiencing self" and the "observing self" as foundational to depersonalized states, especially prominent during dreams.
Franklin (1990): highlighted striking similarities between dreamlike thoughts, typical dream amnesia, and the amnesia seen in DID patients regarding trauma.
Barrett (1994, 1995): drew parallels between dream characters and "alter personalities" in DID concerning cognitive and sensory abilities, movement, amnesia, and consistency with normal awakening.

Recent clinical literature continues to reiterate the similarities between dream states and dissociative symptoms (e.g., Bob, 2004).

Clinically observed phenomena: When individuals fall asleep in class or on public transport, they often experience brief "micro-dreams" where reality merges with dreams.
Historically, the confusion of waking and dreaming states was thought to contribute to dissociative disorders.

Evidence suggests a strong correlation between sleep disruptions and dissociation:
- Patients with depersonalization: symptoms intensify when fatigued (Simeon & Abugel, 2006).
- Childhood sexual abuse survivors: experience sleep paralysis alongside heightened levels of dissociative symptoms (McNally & Clancy, 2005; Abrams et al., 2008).
- Patients across mood disorders, anxiety disorders, schizophrenia, and borderline personality disorder typically show significant sleep abnormalities, including insomnia and nightmares.

Dissociative symptoms and sleep problems are widespread in the general population; for example,
- National Sleep Foundation (2005): reported that 29% of American adults experience sleep problems.

A pivotal study indicated a correlation between dissociation and various sleep phenomena, including vivid dreams, nightmares, and recurrent dreams, measured through the Dissociative Experiences Scale (DES).

Reproducibility: Watson's findings have been confirmed through extensive studies with diverse participant groups and methodologies; establishing a consistent link between unusual sleep experiences and dissociative symptoms.
Specific Connection: Specific sleep phenomena such as nightmares correlate significantly with dissociative symptoms; in contrast, controllable dreams (lucid dreaming) exhibit only weak associations.
- For instance, individuals who reported three or more nightmares over three weeks showed heightened levels of dissociation compared to those who experienced fewer nightmares (Levin & Fireman, 2002).
Patient Populations: This relationship is also noticeable in clinical populations:
- 17 out of 30 DID patients reported nightmare disorder (Agargun et al., 2003).
- Prevalence of nocturnal dissociative episodes: Found to be 27.5% among dissociative disorder patients (Agargun et al., 2001).
- Among borderline personality disorder patients, 49% experienced nightmare disorder, and those with this disorder demonstrated elevated levels of dissociation compared to those without (Semiz et al., 2008).
- Ross (2011): noted that DID patients exhibited higher rates of sleepwalking compared to psychiatric outpatients or general populations.

Overall, there exists a robust connection between dissociative symptoms and unusual sleep experiences, encompassing phenomena like waking dreams, nightmares, and sleepwalking.

Sleep deprivation can be experimentally induced in healthy individuals, leading to heightened dissociative symptoms:
- U.S. Army survival training (2001) demonstrated increased dissociative symptoms due to sleep deprivation (Morgan et al., 2001).
- A separate study tracking 25 healthy volunteers revealed substantial increases in dissociative symptoms following just one night without sleep (Giesbrecht et al., 2007).

A study by van der Kloet et al. (2011) assessed unusual sleep experiences and dissociation within a patient group at a private clinic.
- Patients were surveyed on arrival and after eight weeks; after following a regimen aimed at improving sleep, most reported enhanced sleep quality, coupled with reduced dissociative symptoms.

A potential interpretation of the findings is that a disrupted sleep-wake cycle may incite dissociative symptoms. However:
- The relationship is complex and may be bi-directional. Dissociative symptoms might also cause sleep issues, accompanied by extraneous psychopathological factors complicating the sleep-dissociation relationship (van der Kloet et al., 2011).

This model provides a novel perspective on dissociative symptoms and incorporates the influence of traumatic childhood experiences on sleep disruption, potentially acting as a common pathway to dissociative symptoms:
- This framework may help elucidate how traumatic events disrupt sleep rhythms and lead to dissociative symptoms.

Future studies could identify specific sleep disruptions most closely associated with dissociative disorders, facilitating the development of targeted treatment programs, including medication regimens.
This approach offers a promising new avenue for addressing dissociative symptoms effectively.

The sleep-dissociation model can guide research into a broad array of questions surrounding dissociative symptoms and disorders.
Increasingly, research on sleep and dissociative symptoms is expected to enhance the fields of psychiatry, clinical science, and therapy practices significantly in coming years.