Investigating a Wrist-sensor Oximeter to Screen for Sleep Apnoea.

Patients will be asked to complete a study questionnaires of STOPBANG, SCI-8 (Sleep Condition Indicator-8 questionnaire for insomnia), Epworth questionnaires and medical history. The clinician will record blood pressure, pulse rate and regularity, body mass index and neck circumference. Subjects will be required to wear the wrist sensor pulse oximeter for 1-2 nights. The Oxitone 1000M device measures pulse rate, blood oxygen saturation and movement. The oxygen desaturation events from the wrist sensor device will be statistically compared with the diagnosis assessed using the conventional PPG oximetry, Peripheral Arterial Tonometry and clinical assessment. (clinicians will be masked when analysing the data from the wrist sensor pulse device).