The initial appointment in which the participants were supplied with the Sleepful application on a mobile phone, took approximately 30 minutes. After informed consent had been obtained, participants were given a form to provide personal details. The participants were then asked to familiarise themselves with the mobile handset and were given written instructions. The participants were asked to complete 8 typical tasks on the Sleepful app, each of which was timed after which they completed a TLX questionnaire. The tasks included: opening the app, logging in, setting a wake time, starting/stopping sleep recording, responding to a sleep tone, toggling in/out of bed status, adjusting tone settings. Any participants who struggled to use the application were given extra help until they reported being comfortable. The participants were informed that they would be contacted to return the equipment after the trial period (7 nights) had completed.