Results
Three observations were set to missing, since time stamps indicated that morning assessments were filled in prior to the evening assessments of the previous day.Descriptive statistics separated by study group.Table depicts descriptive statistics on the between-person level.Estimates in the upper diagonal depict estimates in the SH group (sleep hygiene), estimates in the lower diagonal the estimates in the MCII + SH group (mental contrasting with implementation intentions + sleep hygiene). Data for sleep outcomes and self-reported stress were aggregated across baseline and post-intervention weeks. ICC = intra-class correlation.0 = male, 1 = female; 