Related Experiment Video
Updated: Nov 6, 2025
08:36
Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
12.3K
Age and gender differences in objective sleep properties using large-scale body acceleration data in a Japanese
Li Li1,2, Toru Nakamura3, Junichiro Hayano4
1Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka, 560-8531, Japan.
Scientific Reports
|May 12, 2021
Summary
Japanese sleep patterns significantly differ by age and gender. Total sleep time (TST) and time-in-bed decrease in adulthood, while sleep phase shifts earlier with age, impacting sleep quality (SE).
Area of Science:
- Sleep Science
- Gerontology
- Sociology
Background:
- Objective sleep data is crucial for understanding real-life sleep patterns.
- Large-scale studies are needed to identify age- and gender-specific sleep variations.
Purpose of the Study:
- To investigate age- and gender-related differences in sleep properties using objective data.
- To analyze variations in sleep timing, duration, and quality across different age groups and genders in Japan.
Main Methods:
- Utilized objective sleep data from body acceleration signals of 68,604 Japanese individuals (10-89 years old).
- Analyzed sleep properties including time-in-bed, total sleep time (TST), sleep efficiency (SE), and sleep phase.
Main Results:
- Total sleep time (TST) and time-in-bed exhibited a U-shaped association with age.
- Sleep phase shifted earlier with age (>20 years), accompanied by decreased sleep quality (SE).
- Women generally had shorter TST than men, with later bedtimes and poorer sleep quality, especially after age 30 and 50.
Conclusions:
- Significant age- and gender-specific differences in sleep properties exist in the Japanese population.
- Biological aging, socio-cultural, and socio-familial factors likely contribute to observed sleep variations.
- Findings offer valuable insights into Japanese sleep habits for public health considerations.
Related Concept Videos
01:12Measuring Acceleration Due to Gravity
910
Consider a coffee mug hanging on a hook in a pantry. If the mug gets knocked, it oscillates back and forth like a pendulum until the oscillations die out.
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
A simple pendulum can be described as a point mass and a string. Meanwhile, a physical pendulum is any object whose oscillations are similar to a simple pendulum, but cannot be modeled as a point mass on a string because its mass is distributed over a larger area. The behavior of a physical pendulum can be modeled using the principles of...
910
01:11Understanding Sleep
958
Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
958
01:24Substance Use Disorders Affecting Sleep
256
Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
Understanding the concepts of physical dependence,...
Understanding the concepts of physical dependence,...
256