Increased levels of moderate to vigorous physical activity are associated with improved sleep quality, less troubled sleep, and reduced daytime tiredness, according to new research published in the journal Sleep Health. The study marks a pivotal step in understanding the relationship between our daytime activities and sleep health, suggesting a proactive approach to enhancing sleep quality through physical activity.
High-quality sleep remains elusive for many despite widespread knowledge of its importance for health and well-being. Traditional advice on improving sleep quality has typically focused on bedtime routines, such as minimizing screen time, avoiding heavy meals, and reducing alcohol consumption before sleep. However, these recommendations often overlook the potential impact of daytime activities on sleep health.
Recognizing this gap, Lisa Matricciani and her team at the University of South Australia embarked on this research to explore how the activities we engage in during the day, particularly physical activity, might influence various aspects of our sleep.
To conduct their study, the researchers utilized data from the Australian Child Health CheckPoint study, which is nested within the Longitudinal Study of Australian Children (LSAC). This setup provided a rich dataset from a diverse sample, including 1,168 children with an average age of 12 years and 1,360 adults, predominantly mothers, with an average age of 44 years.
To accurately measure physical activity and sleep parameters, participants were equipped with GENEActiv activity monitors. These devices, worn on the non-dominant wrist, are capable of capturing a comprehensive array of movements and provide insights into various levels of physical activity ranging from sedentary behavior to vigorous activity. Participants were instructed to wear these monitors continuously for eight consecutive days.
One of the key findings was that higher levels of moderate to vigorous physical activity were consistently associated with better sleep outcomes across both age groups. This suggests that engaging in physical activities that elevate the heart rate and induce physical exertion can have a positive impact on how well one sleeps and feels during the day.
“What we found is that our daytime activities are tied to different aspects of our sleep, from sleep quality, sleep efficiency (how much of the time you spend in bed when you are actually asleep), and the overall amount of sleep we get, to levels of tiredness during the day, and when we choose to go to bed,” Matricciani said.
Interestingly, the study also found that simply allocating more time for sleep did not automatically result in improved sleep quality. In fact, the simulations conducted as part of the study indicated that increasing sleep duration could predict more restless sleep rather than more restorative sleep.
This counterintuitive finding suggests that while the quantity of sleep is important, the quality of sleep and how it fits within the broader context of an individual’s daily activities also plays a crucial role in determining sleep health.
For children, the study revealed that the activity composition of their day was significantly associated with when they woke up, with sleep duration and sedentary time playing a significant role in their sleep onset, efficiency, and variability. This indicates that not only physical activity but also the balance of sedentary behaviors throughout the day can influence children’s sleep patterns.
For adults, particularly the parents in the study who were mostly mothers, the findings highlighted the significant role of moderate to vigorous physical activity in influencing sleep onset, efficiency, and subjective feelings of tiredness.
Despite its contributions, the study acknowledges certain limitations, including its cross-sectional design, which precludes causal inferences, and the reliance on self-reported measures for some sleep dimensions. Furthermore, the study’s participants, particularly the adult cohort, exhibited higher levels of physical activity than the general population, potentially limiting the generalizability of the findings.
Future research directions include longitudinal studies to explore causality, experiments to test the efficacy of targeted interventions based on these findings, and investigations into the specific types of physical activity that most effectively enhance sleep quality. This study opens new avenues for public health strategies aimed at improving sleep health through the integration of physical activity into daily routines.
“Everyone wants a good night’s sleep. If it’s simply a matter of being more active during the day, then it may be a relatively achievable goal for most of us,” Matricciani concluded.
The study, “Time use and dimensions of healthy sleep: A cross-sectional study of Australian children and adults,” was authored by Lisa Matricciani, Dorothea Dumuid, Ty Stanford, Carol Maher, Paul Bennett, Larisa Bobrovskaya, Andrew Murphy, and Tim Olds.