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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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