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July 25, 2023Sleep Medicine XOpen Access

Beyond sleep duration: Sleep timing is associated with BMI among Brazilian adults

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Authors

GLGiovana Longo‐SilvaAPAnny Kariny Pereira PedrosaPOPriscilla Márcia Bezerra de Oliveira

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Overview

Observational study finds bedtime is significantly associated with BMI in adults, highlighting sleep timing as an independent factor beyond sleep duration.

Key Points

  • To investigate the association of sleep duration and timing with body mass index and identify related unhealthy lifestyle behaviors.
  • Analyzed survey data from 755 adults recruited online, categorizing short sleep as <7 hours/night and late bedtime as after 23:08.
  • Used linear regression, quantile regression at the 25th, 50th, and 75th percentiles, and restricted cubic splines to assess sleep-BMI associations while adjusting for confounders.
  • Bedtime was significantly associated with BMI independently of total sleep duration.
  • Wake-up time showed no statistically significant association with BMI.

Cite This Study

Longo‐Silva et al. (2023) studied this question.

synapsesocial.com/papers/6a0ebdc82eca052da647bdb5https://doi.org/10.1016/j.sleepx.2023.100082
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Also Consider

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  1. 1Sex Differences in the Association between Sleep Quality and Excess Weight: Exploring Lifestyle and Health-Related Mediators.2025 · 2 citations
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  4. 4Optimal nap timing and body mass index: beyond duration2026 · 1 citations
  5. 5Sleep duration, sleep quality, body mass index, and waist circumference among young adults from 24 low- and middle-income and two high-income countries2026