IntroductionTo assess the effectiveness of interventions combining pink noise or binaural beats with pure music in improving sleep quality and reducing perceived stress among college students, and to preliminarily investigate their effects on morning salivary cortisol levels.MethodsUsing a three-group randomized controlled design, 66 college students with poor sleep quality (PSQI score >7) were randomly assigned to a pink noise + pure music group, a binaural beats + pure music group, or a contro