RT Journal Article T1 Sleep habits and circadian preferences in school-aged children attending a Mexican double-shift school system A1 Arrona-Palacios, Arturo A1 Díaz Morales, Juan Francisco A1 Adan, Ana AB Objective: To determine the differences between sleep habits and circadian preference in school-aged children attending a Mexican double-shift school system. Methods: This cross-sectional study consisted of 400 elementary public-school children (mean age = 10.77, SD = 0.70 y, from 4th, 5th and 6th grades) in Reynosa, Tamaulipas, in northeastern Mexico. Attending a double-shift school system: 200 from the morning shift and 200 in the afternoon shift. Specific questions regarding sleep habits were collected and for circadian preference, the Morningness-Eveningness Scale for Children (MESC) was used. Results: Multivariate analysis reported no sex differences. Children attending at the morning shift during weekdays rose earlier, reported shorter time in bed and earlier midpoint of sleep than those in the afternoon shift. On weekends, morning shift children went to bed later than afternoon shift. Morning shift reported greater social jetlag, shorter average sleep length and more sleep deficit than afternoon shift. During weekdays and weekends evening type children went to bed later, rose later and reported later midpoint of sleep. Also, evening type reported more social jetlag than morning types.Conclusion: This study suggests that early school start times can have a detrimental effect on Mexican children. Moreover, the morning shift children may be at more risk of poor health due to the higher social jetlag, as well as a higher tendency to be sleep deprived. On the other hand, the afternoon shift represents an important social environment that allows children to follow their natural physiological needs and a more optimal sleep health. PB Elsevier YR 2021 FD 2021-05 LK https://hdl.handle.net/20.500.14352/92917 UL https://hdl.handle.net/20.500.14352/92917 LA eng NO Arrona-Palacios, A., Díaz-Morales, J. F., & Adan, A. (2021). Sleep habits and circadian preferences in school-aged children attending a Mexican double-shift school system. Sleep Medicine, 81, 116-119. NO Ministerio de Economía, Industria y Competitividad (España) NO Ministerio de Economía y Empresa (España) DS Docta Complutense RD 9 ago 2024