Participants were booked to attend the sleep laboratory for seven consecutive nights (plus additional recovery nights if required to recover from the experimental nights), based on their availability and the availability of the laboratory. They resided in a private, self-contained bedroom (like a hotel room, with a king-size single bed, ensuite and shower facilities) and were welcome to use a shared lounge, kitchen and washing facilities.
We also posted a sleep monitoring device (like a FitBit) and sleep diary, that participants will be asked to use for two weeks prior to their laboratory stay.
Upon arrival at the sleep laboratory on the very first evening, participants were familiarised with the facility and the experimental procedures and given an opportunity to settle into your bedroom. After dinner, research personnel including trained sleep and sound technicians, set up participants with sleep-recording devices. Participants then undertook a listening test to examine annoyance and acceptability for sleep toward different noise types, and complete questionnaires.
At their usual bedtime, lights were turned off in participants’ bedrooms for sleep.
Each morning, four saliva samples at 15-minute intervals as a measure of stress-response (cortisol, and a 5th sample in the evening). Participants were then asked to complete a sequence of computerised tasks and questionnaire.
On a single occasion, a small hair sample was collected to measure long-term stress and, on another occasion, participants attended a 60-minute clinical audiology appointment at the Flinders Medical Centre Audiology Clinic.