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April 3, 2026Journal of Translational MedicineOpen Access

Optimal nap timing and body mass index: beyond duration

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Authors

GLGiovana Longo-SilvaMRMaría D. Rodríguez-MartínDSDiego Salmerón

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Overview

Investigates nap timing's association with BMI in habitual nappers, indicating potential behavioral links to weight management.

Key Points

  • The aim is to explore how nap timing, relative to daily events, is associated with body mass index (BMI) among habitual nappers.
  • Analyzed data from 3550 habitual nappers aged 18–65 years from Spain and Brazil.
  • Measured nap timing relative to wake time and lunch time
  • Evaluated nap duration and weekend-weekday differences (nap jet lag) in relation to BMI.
  • Applied linear regression and restricted cubic spline models to analyze the data.
  • Brazilians had earlier naps by over 2 hours and longer weekend naps compared to Spaniards (p < 0.001).
  • BMI was highest for early naps, with notable inflection points indicating optimal timing for lower BMI.
  • Shorter and consistent nap durations were associated with lower BMI (p < 0.05).
  • The study suggests significant behavioral associations between nap timing and BMI warranting further investigation.

Cite This Study

Longo-Silva et al. (2026) studied this question.

synapsesocial.com/papers/69cf5fe05a333a821460eab2https://doi.org/10.1186/s12967-026-08049-6
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Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

  1. 1Beyond sleep duration: Sleep timing is associated with BMI among Brazilian adults2023 · 11 citations
  2. 2Nap Timing Matters: Later Siesta Associates with Increased Muscle Mass and Decreased Fat Mass in Spain and the US2026
  3. 3Bidirectional associations between the duration and timing of nocturnal sleep and daytime naps in adolescents differ from weekdays to weekends2024 · 6 citations
  4. 4The Association of Midday Napping With Hypertension Among Chinese Adults Older Than 45 Years: Cross-sectional Study2022 · 15 citations
  5. 5Sex-specific chrono-nutritional patterns and association with body weight in a general population in Spain (GCAT study)2024 · 1 citations