![]() Indeed, I-SSD has been linked to a range of medical and psychiatric co-morbidity, including adverse cardiometabolic outcomes, neurocognitive impairment and sleep-wake misperception 10. First-night polysomnography (PSG) has been used to identify an objective insomnia subtype with short-sleep duration (I-SSD: 6 hours total sleep time) 10. One aspect of who responds to CBT may be explained by differing insomnia subtypes. Little assessment of CBT treatment modalities is available in the insomnia population especially when treatment is an addition to a research study, with different offered CBT modalities. Digital CBT would be the entry treatment modality where group and or one-on-one therapy with an expert Psychologist would be required when participants are non-responders 7. Stepped care models have been proposed as a potential solution promoting low-cost access to CBT 6, 7, 8, 9. CBT is now considered as a first line intervention but lacks health system capacity for delivery to the insomnia population 5. Research has focused on pharmacological (hypnotics) and non-pharmacological treatments with cognitive behavioural therapy (CBT) delivered either as face-to-face or internet-based therapy 1, 3, 4. Insomnia is a common and distressing disorder that impairs quality of life and affects approximately 6 to 10% of the adult population 1, 2. Results may be comparable to clinical participants with implications for the successful translation of CBT for insomnia. In this cohort, 60 (63%) of participants attempted CBT and of those 28 (47%) completed therapy. Those with normal-sleep were more likely to respond (≥6-point ISI reduction) to CBT compared to short-sleep (70%, n = 14/20 vs. For potential efficacy, 39 (normal-sleep = 20, short-sleep = 19) out of 96 participants (41%) completed a follow-up ISI assessment. ![]() CBT was acceptable to 63% of participants (normal-sleep = 31, short-sleep = 29), with 28 completing therapy (tolerability: normal-sleep = 11, short-sleep = 17). 96 participants (61 females, mean age of 41 years) were grouped into either normal-sleep (n = 53) or short-sleep (n = 43). Follow-up occurred at three months post-treatment using the insomnia severity index (ISI). ![]() All research volunteers were offered access to digital CBT, single component sleep restriction therapy and face-to-face group CBT. In this retrospective cohort study, we describe acceptability, tolerability and potential efficacy of cognitive behavioural therapy (CBT) in Insomnia Disorder subtypes, derived from polysomnography (PSG): insomnia with normal-sleep duration (I-NSD) and insomnia with short-sleep duration (I-SSD).
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