A Comparison of CPAP With and Without Humidification: A Pilot Study

Inclusion Criteria: * Older than 18 years of age * Diagnosed with OSA (obstructive sleep apnea) and eligible for CPAP treatment under local requirements (NICE guidelines: AHI (apnea hypopnea index) ≥ 15, or AHI \> 5 with significant daytime sleepiness) * Naïve to CPAP therapy, i.e. have not been prescribed, or used CPAP in the last 5 years. * Fluent in spoken and written English Exclusion Criteria: * Significant uncontrolled cardiac disease, as per the principal investigator's discretion * Co-existing lung disease, as per the principal investigator's discretion * Co-existing sleep disorder, such a predominant central sleep apnoea * Pregnancy * Participants that are unable or unwilling to give informed consent.