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Updated: Jun 21, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments
Published on: August 8, 2019
Falling asleep: the determinants of sleep latency
G M Nixon1, J M D Thompson, D Y Han
1Ritchie Centre for Baby Health Research, Monash Institute of Medical Research, Monash University, Melbourne, Australia.
Insights
Promoting physical activity in children can reduce difficulty falling asleep. Higher daytime activity decreases sleep latency, while sedentary time increases it, highlighting the importance of movement for good sleep.
Area of Science:
- Pediatric Sleep Science
- Childhood Physical Activity
Background:
- Prolonged sleep latency is a common issue in school-aged children.
- Understanding factors influencing sleep onset is crucial for pediatric health.
Purpose of the Study:
- To determine the typical sleep latency in 7-year-old children.
- To identify key factors, particularly physical activity, affecting sleep duration.
Main Methods:
- Objective measurement of sleep and daytime activity using actigraphy in 519 children at age 7.
- Data collected from an initial cohort of 871 children recruited at birth.
Main Results:
- Median sleep latency was 26 minutes.
- Increased daytime physical activity was linked to shorter sleep latency.
- Sedentary activity was associated with prolonged sleep latency.
Conclusions:
- Childhood physical activity is vital for promoting healthy sleep patterns.
- Encouraging active lifestyles can help mitigate sleep onset difficulties in children.
Background:
Difficulty falling asleep (prolonged sleep latency) is a frequently reported problem in school-aged children.
Aims:
This study aimed to describe the distribution of sleep latency and factors that influence its duration.
Methods:
871 children of European mothers were recruited at birth. 591 (67.9%) children took part in the follow-up at 7 years of age. Sleep and daytime activity were measured objectively by an actigraph worn for 24 h.
Results:
Complete sleep data were available for 519 children (87.8%) with a mean age of 7.3 years (SD 0.2). Median sleep latency was 26 minutes (interquartile range 13-42). Higher mean daytime activity counts were associated with a decrease in sleep latency (-1.2 minutes per 102 movement count per minute, p = 0.05). Time spent in sedentary activity was associated with an increase in sleep latency (3.1 minutes per hour of sedentary activity, p = 0.01).
Conclusions:
These findings emphasise the importance of physical activity for children, not only for fitness, cardiovascular health and weight control, but also for promoting good sleep.
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