Agreement between parental reports and accelerometer measures of sleep duration in primary school children

Do parents know how long their children sleep? A look at real-world data.

Sleep is one of the pillars of children’s health. It supports their growth, learning, mood, and behaviour. That’s why researchers and health professionals are so interested in knowing how much children sleep — and whether they are getting enough rest.

One common way to gather this information is by asking parents how long their children usually sleep. Another increasingly used method is to use small wrist-worn devices called accelerometers, which track movement and give us an objective estimate of sleep duration.

In our recent study, we wanted to understand how closely these two methods agree. We worked with a large sample of over 700 primary school children from socially vulnerable communities. Each child wore an accelerometer for seven consecutive days, and their parents filled out a questionnaire reporting how many hours their child typically sleeps.

The results revealed a significant mismatch: parents tended to overestimate their children’s sleep by a wide margin. On average, parent-reported sleep duration was notably longer than what the accelerometers recorded. In other words, many children were sleeping less than their parents believed.

This is important because it shows that relying only on parent-reported sleep data may not give us an accurate picture of children’s sleep habits — especially in research, public health, or school-based programs aiming to improve child well-being.

Our study also highlights how critical it is to use objective tools like accelerometry when possible, especially in populations that may be at greater risk for sleep problems due to social or economic disadvantages. These tools can help identify children who aren’t getting enough sleep and guide targeted interventions.

At the same time, we’re not suggesting that parent reports are useless — they are still valuable, especially when objective tools aren’t available. But being aware of their limitations is key.

Ultimately, promoting healthy sleep in children means understanding their real sleep patterns. Our findings suggest we need to combine parent perspectives with objective data to truly support children’s health — particularly in communities where the challenges are greater, and the need for accurate information is even more urgent