“…Cross-sectional studies conducted during the pandemic have specifically found that the feeling of boredom mediates the relationship between loneliness and depression among college students [ 39 ]; is one of the most frequently cited reasons for increased alcohol and substance use (e.g., smoking, vaping) among adults in the general population [ 40 , 41 , 42 , 43 , 44 , 45 , 46 ]; is inversely related to feelings of happiness [ 18 ]; is positively related to symptoms of depression, anxiety, stress, and insomnia among healthy controls and among psychiatric outpatients and inpatients [ 47 , 48 ], as well as a marked fear of COVID-19 among adolescents [ 49 ]; and is positively associated with problematic social media use among adult users [ 50 ]. Cross-sectional studies examining the link between trait boredom and mental health during COVID-19 have found positive associations between the former and perceived stress among civil servants working from home [ 51 ] and among university students [ 52 ], as well as depression, fear, obsessions and compulsions, illness anxiety, psychological distress, and internet addiction among adolescents [ 53 ] and adults in the general population [ 54 , 55 , 56 ].…”