This PhD thesis explored sleep health through three studies. First, a meta-analysis of 77 studies examined how goal motives influence goal achievement. Second, the research proposed a new definition and measurement of bedtime procrastination, investigating its relationship with sleep patterns and motivational factors. Finally, the study tested a self-regulatory technique (MCII), finding that daily implementation reduced bedtime procrastination by 16 minutes compared to one-time application, leading to improved affect among participants
