The intervention group
confusion, insomnia, SE, sleep diary).Access, OSF DOI
SLEEP START
Participants in the Intervention group received all following components:An individual session conducted by a provisional psychologist (MAS), under the supervision of a Clinical Psychologist (BB), that covered: (1) the differences between sleep variables measured using self-report and sleep wearables, (2) the nature of sleep–wake state discrepancy and its relevance to insomnia, and (3) interpretation of sleep–wake state discrepancy using participants’ own baseline sleep data (measured via Fitbit, Dreem, and sleep diary).Access to daily Fitbit sleep data through the Fitbit app, including TST, sleep start time, and wake time.An illustrated report emailed weekly throughout participation (see in Protocol Supplement, OSF DOI: 10.17605/OSF.IO/T2YJS), which included both daily and weekly summaries of: (1) TST (sleep diary and Fitbit), (2) sleep efficiency (sleep diary and Fitbit), (3) SOL (sleep diary and Dreem), (4) WASO (sleep diary and Dreem) and (5) sleep stages (Dreem); sleep diary variables were either compared with Fitbit (i.e. TST and SE) or Dreem (i.e. SOL and WASO), and never both at the same time to avoid confusion. Data from two sources were plotted together (e.g. sleep diary and Fitbit TST), and these figures were accompanied by interpretations of discrepancies and information on how to use this information for managing concerns about sleep. These reports were automatically generated using an R-script that fetched data from Fitbit and Dreem servers via application programming interfaces (i.e. API).