A prospective observational cross-sectional study assessing risk of insomnia and obstructive sleep apnoea in UK adults using validated screening tools (Insomnia Severity Index, STOP-Bang, and FOSQ-10)
Insomnia disorder; Obstructive sleep apnoea (OSA); Comorbid insomnia and sleep apnoea (COMISA); Sleep-related functional impairment
Participants will complete a single web-based survey (JotForm) including validated screening tools: the Insomnia Severity Index (ISI), the STOP-Bang questionnaire for obstructive sleep apnoea risk, and the optional Functional Outcomes of Sleep Questionnaire (FOSQ-10). On completion, participants receive tailored risk feedback and signposting to healthcare support if at elevated risk. Data collection occurs once at baseline, with no follow-up.
1. Adults aged 18 years or older 2. Resident in the United Kingdom 3. Able to access and complete an online survey in English 4. Occupation may include employee or learner/student (18+ years)
1. Individuals under the age of 18 years 2. Non-UK participants, identified through IP address location at survey entry 3. Incomplete survey responses (missing core outcome data)