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Related Concept Videos

Insufficient Sleep and Sleep Deprivation01:13

Insufficient Sleep and Sleep Deprivation

Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Circadian Rhythms and Gene Regulation02:19

Circadian Rhythms and Gene Regulation

The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...

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Related Experiment Video

Updated: May 15, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
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Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Tracking the Night: Measuring Age and Sex Patterns in Sleep Duration Using Wearable Technology.

Eun Jin Lee1, Eun Yeon Joo2, Hyunjun Jung3

  • 1Department of Psychology, Sungshin University, Seoul, Republic of Korea.

Sleep
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Adult sleep duration varies significantly by age and sex, with longer sleep on weekends. These objective findings offer new benchmarks for sleep health.

Keywords:
Samsung Galaxy Watchage differencesconsumer sleep trackingsex differencessleep durationwearable technologyweekday-weekend variability

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Published on: October 2, 2019

Area of Science:

  • Sleep Science
  • Public Health
  • Wearable Technology

Background:

  • Sleep duration is crucial for overall sleep health.
  • Previous population studies on sleep duration used limited self-report measures or varied objective devices.
  • Consumer-grade wearables offer a unified approach to objective sleep measurement.

Purpose of the Study:

  • To examine the normal variation in sleep duration within an adult population.
  • To utilize data from a single type of consumer-grade wearable device with a unified algorithm.
  • To establish population-level reference distributions for objectively measured sleep duration.

Main Methods:

  • Retrospective cohort study of 274,128 U.S. adults (aged 20-69) using Samsung Galaxy Watches.
  • Sleep duration defined as longest continuous nighttime sleep (6 PM-6 AM), averaged over three months.
  • Analysis of sleep duration and weekday-weekend variability across age groups and by sex.

Main Results:

  • Average sleep duration was 7.57 hours (10th-90th percentile: 6.5-8.9 hours).
  • Sleep duration varied by age (shortest in 40-49 years, longest in 60-69 years) and sex (women slept longer).
  • Weekend sleep averaged 28 minutes longer than weekday sleep, with greater variability observed in women.

Conclusions:

  • Objectively measured sleep duration shows considerable variation across adulthood.
  • Findings provide reference distributions for sleep duration based on age and sex.
  • Results can inform clinical expectations and public health messaging on sleep duration.