Exploratory outcomes
Exploratory outcomes included (1) sleep–wake state discrepancy parameters: TST discrepancies were calculated for diary-Fitbit differences (sleep diary minus Fitbit) and diary-Dreem differences (sleep diary minus Dreem); SOL and WASO differences were calculated for diary-Dreem differences (sleep diary minus Dreem), (2) the 16-item Dysfunctional Beliefs and Attitudes about Sleep [