The National Sleep Foundation published its landmark sleep duration re--ations, the first of its kind, in 2015. Marking the 10-year anniversary of this pivotal work, the National Sleep Foundation embarked on a systematic review and narrative synthesis of meta-analyses to determine if the sleep duration re--ations require adjustment and to examine potential sex differences in sleep duration re--ations. A focused systematic review of the previous decade of published, peer-reviewed meta-analyses on normal sleep duration was conducted in June 2025 using National Library of Medicine's PubMed, Elsevier's EMBASE, and Clarivate's Web of Science. After screening, eligibility assessment, and extraction, a total of 133 meta-analyses were included in the review. Through a double review process, data were extracted and used to determine whether articles were (1) consistent with NSF re--ations, (2) contradictory with NSF re--ations, or (3) inconclusive regarding NSF re--ations. The majority of the articles (74%; n = 99) were consistent with the NSF's sleep duration re--ations, with most meta-analyses focused on adult age groups. The remaining 34 (26%) articles were inconclusive, with no articles found to be contradictory regarding both short and long sleep durations re--ations. The majority of meta-analysis reported nonsignificant sex differences. This review re-certifies the NSF's sleep duration re--ations. Findings also identified multiple directions for future research, including calls for greater study of positive benefits from achieving the NSF-re--ed sleep duration as well as greater use of evidence-based sleep duration thresholds in empirical research.