Assessing the Impact of Brief CBTi on Dissociative Seizures: SCED

Some people experience a temporary change in behaviour and consciousness, that often involves a collapse and/or shaking limb movements. These are referred to as 'Dissociative seizures'. Those who experience such seizures have been found to also display high levels of dissociation, which can be described as a change in your conscious experience and may include gaps in your memory for events. It is thought that people who experience dissociative seizures also often have difficulties with their sleep. Having difficulties with sleep may make these seizures and the amount of dissociation an individual experiences worse. Greater dissociation may be additionally linked to worsening dissociative seizures. A psychological treatment for sleep difficulties called Cognitive Behavioural Therapy for Insomnia (CBTi), has been found to be effective in reducing sleep difficulties.

The main questions this study aims to answer are:

1. Does brief CBTi (bCBTi) improve sleep difficulties in those with dissociative seizures?
2. Does bCBTi reduce the frequency of dissociative seizures?
3. Does bCBTi reduce self-reported levels of dissociation in participants?
4. Does improving sleep difficulties lead to improvements in quality of life, mood and anxiety levels?
5. Is bCBTi a feasible intervention to administer in an inpatient setting?

This study will investigate whether improving sleep by administering a brief version of CBTi leads to an improvement in levels of dissociation and dissociative seizure frequency. It will also investigate whether brief CBTi is a feasible treatment method for sleep difficulties in an inpatient setting.

Participants who have dissociative seizures and sleep difficulties that could be diagnosed as insomnia will be randomly assigned to a baseline phase of 5, 7 or 9 days, where they will fill out daily questionnaires on their sleep, dissociation and number of seizures. They will then begin a 10-day intervention phase where they will attend two sessions of brief CBTi, whilst also completing daily measures. This will allow us to see whether their scores on the sleep and dissociation measures improve when the intervention begins. Participants will be asked to wear an Actiwatch during the night, to gather information on their movement levels during the night. Information on changes in quality of life, mood and anxiety levels following the sleep intervention will also be collected.

Design: This study will use a Multiple Baseline Single Case Experimental Design (SCED). This design has been chosen as it can test the effectiveness of an intervention on a small number of participants. This is of benefit as it allows the piloting of a novel intervention, which brief Cognitive Behavioural Therapy for Insomnia (bCBTi) for those with dissociative seizures will be. It will involve each participant being randomly assigned to a baseline phase of three possible lengths: 5 days, 7 days and 9 days. This will be done using https://www.randomizer.org/ which will generate a random order of the three categories. During the baseline phase, sleep difficulties and levels of dissociation will be measured on a daily basis. The participant will then begin the intervention phase, where they will receive two sessions of bCBTi. Sleep difficulties and levels of dissociation will continue to be measured on a daily basis during the intervention phase. Participants can therefore serve as their own controls. The multiple baseline element controls for time as a confounding variable which increases the study's internal validity, and allows the relationship between variables to be viewed as causal rather than correlational. Guidelines for constructing good quality SCEDs have been used to inform the study protocol.

Recruitment: The study will take place at the William Quarrier Scottish Epilepsy Centre (WQSEC), recruiting current inpatients who meet the criteria for inclusion in the study. Potential participants will be identified and approached initially by the clinical nurse specialist (CNS) on the ward who has access to patient information and is alerted of any new inpatients. The CNS will provide the potential participant with an information sheet, and ask if they would consent to the principal investigator speaking to them to go through it, answer any questions and obtain informed consent. If the participant agrees to participating, the baseline measures will also be completed at this stage. Overall, the recruitment stage should take around 1 hour of participant's time over a couple of days.

Baseline phase: The participant will then enter a randomly assigned baseline phase of 5, 7 or 9 days in length, which will involve them completing two short measures on a daily basis and wearing an actiwatch during the night. It will take around 10-15 minutes to complete the measures each day. Nursing and/or Health Care Assistants on the ward may assist with prompting participants to complete the measures throughout the duration of the study if they have capacity in addition to their primary clinical duties.

Intervention phase: Once they have completed their baseline phase, they will begin the intervention phase, which will involve attending two sessions of bCBTi with a clinical psychologist on the ward. Each session will last between an hour to an hour and a half. The sessions will be three days apart, one on a Monday and one on a Friday. The participants will continue to complete daily measures during this time, and will continue to wear the actiwatches.

Post-intervention phase and study completion: Following the two sessions of bCBTi, the participants will continue to complete the daily measures and wear the actiwatch for 7 days. Following this, the principal investigator will meet with the participants to complete the post intervention measures, which are the same as the pre-intervention measures. At this meeting, the principal investigator will also debrief the participants on the study. This meeting will take around an hour.

Eligibility Criteria:
Inclusion Criteria:

* aged 18+ (no upper age limit);
* can speak and read English fluently;
* must score ≤16 on the Sleep Conditions Indicator (SCI);
* must demonstrate compelling evidence that at least some of their seizures are likely to be dissociative, based on at least one of the following:

  1) Opinion of the referring consultant, WQSEC consultant, or WQSEC clinical nurse specialist, based on:
* Direct witnessing of seizure(s)
* Review of video footage
* Semiology as suggested by reliable patient or family history. 2)EEG assessment showing seizures without EEG change correlated. The participant must have received feedback that they are experiencing dissociative seizures and is accepting of this as an explanation.

Exclusion Criteria:

* active and significant mental health problems and/or moderate to severe learning disabilities (IQ score of ≤50);
* unable to give informed consent;
* non-fluent English speakers;
* current participation in another research study;
* dissociative seizures that have been assessed by the WQSEC clinical psychologist and/or consultant as potentially deliberate behaviour driven by secondary gain.