“…Hence, the consistency across the studies strengthens our findings, emphasizing the association between IA and sleep. The consistency could be attributed to the commonly used IA and sleep instruments: 17 studies used the IAT to assess IA (19,20,43,45,47,52,53,56,(58)(59)(60)(61)(62)(63)(64)(65)68) and nine used the PSQI to assess sleep problems (38, 45-47, 57, 60, 62, 63, 66). Furthermore, the high quality of these studies (all studies have clearly defined their objectives, variables, and measurement using well-established criteria) and the comparable participants in these studies (19 studies on high school or university students [19, 38, 43-47, 52, 53, 57, 58, 60-62, 64-68]) ensure the homogeneity among the studies and result in consistent findings.…”