This randomized feasibility study is designed to investigate the feasibility of recruitment and delivery of two variations (brief; full) of a virtual Integrative Restoration (iRest) yoga nidra meditation intervention in stressor- or trauma-exposed participants with insomnia and posttraumatic stress symptoms, compared to a waitlist control group. Feasibility will also be examined for data collection (daily sleep diaries and PTSD symptom surveys) and at-home polysomnography (PSG) study completion prior to and following the intervention. Feasibility measures will include study retention and-for the two yoga nidra groups-adherence to study protocol, and acceptability of the intervention will be assessed qualitatively, in semi-structured interviews, and quantitatively, with the Client Satisfaction Questionnaire, following the intervention. Acceptability of the daily surveys will also be assessed quantitatively.
Preliminary efficacy of the interventions on the primary treatment outcomes of insomnia and PTSD symptoms and symptom clusters will be assessed. Secondary outcomes include changes in specific sleep architecture assessed in an at-home polysomnogram (sleep stages, including stage N3 percentage, sleep spindles, rapid eye movement (REM) theta, total sleep time, wake after sleep onset time, sleep onset latency, sleep efficiency), daily sleep characteristics (total sleep time, sleep onset latency, wake after sleep onset time, sleep quality), daily PTSD symptoms, and mindfulness. Exploratory outcomes include sleep quality, experiential avoidance, emotion regulation, self-compassion, depression, anxiety, and nightmares.