strategies and policies. Its comprehensive and regularly updated database enables comparisons 11 across health states, regions, and years. However, certain methodological features, combined 12 with the study's considerable influence, may inadvertently contribute to the neglect of 13 conditions that are critical to population health. This Editorial highlights the 14 underrepresentation of sleep disorders in current disease burden research, notably the GBD 15 study.A substantial body of evidence demonstrates that restorative sleep is essential for mental, 17 physical, and societal well-being, as well as economic prosperity 1 4 . Sleep disorders that reach a clinically significant 24 threshold are also common. For example, severe insomnia affects approximately 8% of the 25 general population 5 , and sleep apnea occurs in 9% to 38% of adults 6 .Despite this considerable burden, sleep disorders have been absent from GBD publications 27 since the 2004 update 7 . They are currently neither included as primary disorders nor as risk 28 factors 8 . Consequently, key burden metrics such as disability-adjusted life years (DALYs) 29 remain underreported for conditions of inadequate sleep. This gap is notable given that many 30 rare diseases, symptoms, and risk factors are routinely included in GBD analyses. The reason 31 for the exclusion of sleep disorders is unknown to the authors of this Editorial, also considering 32 that GBD estimations could be informed by primary data from large epidemiological resources, 33 such as the UK Biobank 2 .The exclusion of sleep disorders from multi-disease burden reports such as the GBD study has
Welter et al. (Wed,) studied this question.