A prospective, randomised, blinded pilot study comparing the Sunrise solution and overnight polygraphy for the diagnosis of OSA in adult patients. Patients under investigation for OSA will use both devices simultaneously for a single overnight sleep study. They will be randomised to receive their treatment decision based on either the Sunrise solution or polygraphy. A retrospective check of their diagnosis will be done.

Inclusion Criteria:

1. Aged ≥18
2. Ability and willingness to provide informed consent
3. Patient referred for suspected OSA
4. BMI >28 kg/m2
5. Epworth Sleepiness Score >12
6. Reported snoring (criterion may be ignored if patient sleeps alone)
7. Patient able to use a smartphone application and having an internet connection at home

Exclusion Criteria:

1. Patient already treated for OSA
2. Patient has PSV or HGV driving license
3. Unstable cardiac disease
4. Supplemental oxygen
5. Known secondary sleep pathology e.g. Periodic Limb Movement Syndrome, Narcolepsy, Circadian Disorder, Obesity Hypoventilation Syndrome
6. Concerns about sleepy driving or any other potentially dangerous symptom from physician or urgent referral from GP when patient has been told to stop driving
7. Pregnant woman, parturient, nursing mother, person deprived of liberty by judicial or administrative decision, person subject to a legal protection measure
8. Patient whose beard is too thick to wear the Sunrise device, and who does not wish to shave
9. Patient with acrylic or painted fingernails, who does not wish to remove acrylic or paint

Patients under investigation for OSA will use both devices (Sunrise solution and overnight polygraphy) simultaneously for a single overnight sleep study. They will be randomised to receive their treatment decision based on either the Sunrise solution or polygraphy. They will be unaware of which device their treatment decision was based on.