2.6. Adherence Assessment
To assess their adherence to the use of the assigned pajamas, participants were given a logbook to record their wearing of the assigned pajamas during the six-week study period. The total number of days when the pajamas were worn was counted. Subjects were considered non-adherent if they missed more than two nights in a week. The participants were provided with free pajamas but did not obtain monetary compensation or other awards for adhering to the intervention.