Introduction
sleep disturbance, fatigue, anxiety, sleepiness, insomnia, Insomnia, morning awakenings, depression, sleep-related impairment
SECONDARY
Insomnia involves difficulties with initiating sleep, maintaining sleep, and early morning awakenings [Insomnia is diagnosed based on individual’s self-report (e.g. questionnaire, sleep diary, and clinical interview) [Sleep–wake state discrepancy is a common phenomenon observed in 9%–50% of individuals with insomnia [Sleep–wake state discrepancy is important to explore as it is linked to daytime functioning, self-reported happiness, social support [Sleep–wake state discrepancy has been found to be modifiable. Downey and Bonnet (1992) [In recent years, with the increased use of consumer sleep wearable devices, individuals with insomnia are increasingly recording their own sleep data [This current study aims to examine whether providing individuals with insomnia feedback about sleep using wearable devices, along with support for appropriate interpretation of sleep–wake state discrepancy improves (1) symptoms of insomnia as the primary outcome, (2) sleep disturbance and sleep-related impairment (SRI)s, sleepiness, fatigue, symptoms of depression and anxiety as secondary outcomes, as well as (3) sleep–wake state discrepancy, dysfunctional beliefs and attitudes about sleep, and pre-sleep arousal (PSA) as exploratory outcomes; the latter two were explored due to their relevance to both insomnia and sleep–wake state discrepancy [