[Article published on October 5, 2025]

Every night, millions of parents close the door to their child’s room, convinced they are sleeping peacefully. However, this certainty hides a very different reality. A recent study conducted by researchers from Brown University, in collaboration with the Warren Alpert Medical School and Rhode Island Hospital, reveals a striking discrepancy between parental perceptions and actual sleep among children.

Published in the journal Frontiers in Pediatrics, this investigation is based on objective data from actigraphs worn by 102 elementary school children. The findings are concerning: the majority of them do not meet the official sleep duration recommendations. Additionally, there are clear disparities between Latino and non-Latino children. These results not only raise questions about attention to young children’s sleep but also the basis on which adults make their judgments.

A significant disconnect between parental perception and sleep reality

The study highlights a significant disconnect between what parents believe to be their child’s sleep duration and the measured reality. Out of the 102 elementary school children equipped with actigraphs, 83% of parents thought their child was getting enough sleep, while only 14.7% were actually meeting the official recommendations of 9 to 12 hours per night for 6-12-year-olds, as defined by the American Academy of Pediatrics. Actigraphy measures sleep through body movements recorded by a sensor worn on the wrist.

The overestimation is clear. Parents reported an average duration of 9.58 hours, but the objective data showed an actual sleep time of 8.32 hours. This difference of more than an hour is partly explained by two underestimated variables: sleep onset latency (time to fall asleep) and time spent awake after falling asleep. Parents, often absent or already asleep during these brief awakenings, do not perceive these interruptions.

The problem is twofold. It is not just a quantitative discrepancy, but also a qualitative one. The researchers point out that adults often confuse “bedtime” with “actual sleep,” distorting their evaluation. This perception error compromises the early detection of sleep disorders, which can directly impact concentration, memory, emotional regulation, and growth.

The authors advocate for better education of families on the actual parameters of sleep, emphasizing the importance of measuring not only duration but also the continuity and quality of sleep.

Nocturnal awakenings: a blind spot in parental vigilance

One of the most enlightening aspects of the study concerns Wake After Sleep Onset (WASO), which is the time children spend awake after falling asleep. This parameter, not easily visible to parents, represents a significant blind spot in family assessments of sleep. On average, the sensors recorded 38.27 minutes of WASO per night, while parents reported less than 5 minutes.

This discrepancy reveals that many children have fragmented sleep, escaping parental supervision. Children may briefly awaken several times without getting up, talking, or crying. They often remain calmly lying down, making it difficult for adults to detect these awakenings. This lack of external signs contributes to underestimating the problem.

The study authors emphasize in a statement that these undetected awakenings are not trivial. Fragmented sleep impairs cognitive recovery, disrupts deep sleep cycles, can lead to mood disorders or attention difficulties during the day. Furthermore, these awakenings may not be recognized by the children themselves, as they sometimes have no recollection upon waking.

The analysis also showed that parents’ daily evaluations in sleep journals were not more reliable. Even with consistent completion of these questionnaires, adults regularly overestimated sleep time. This is partly because they confuse time in bed with actual sleep time, as mentioned earlier.

These results raise questions about the reliability of subjective tools often used in pediatrics or sleep epidemiology. Ultimately, they call for popularizing objective indicators among the general public to help parents better detect warning signs.

Significant disparities between Latino and non-Latino children

The study incorporated a rarely explored dimension in children’s sleep research: ethnic disparities, particularly between Latino and non-Latino children in the USA. The results show clear differences in both sleep quantity and quality. Among the sample analyzed, 56% of children came from Latino families. Among them, only 4.4% met the official sleep recommendations, compared to 22.8% among non-Latino children.

Latino children slept an average of 8.04 hours per night, compared to 8.53 hours for others. Objective data analysis also revealed significantly shorter total time in bed in the Latino group: 9.19 hours versus 9.69 hours.

These differences could be influenced by cultural practices such as later bedtime, co-sleeping, or room-sharing with older siblings, more common in Latino families. These habits may delay falling asleep or lead to more nocturnal awakenings, making their detection more challenging.

Another striking finding: while 88.9% of Latino parents claimed their child slept “the right amount,” their children were the least likely to meet the standards. This contradiction highlights a possible cultural bias in the perception of sleep. However, these parents were also more likely to report that their child’s sleep was problematic, showing greater awareness than in other groups, despite overestimating sleep time.

These results underscore the need to better contextualize health data according to cultural practices. Furthermore, recommendations that take into account specific family and social realities must be developed.

An underestimated health alert
and underutilized action levers

Beyond the numbers, researchers draw attention to a silent health alarm. Lack of sleep, often chronic, affects a large portion of elementary school children and could have lasting effects on their physical, mental, and cognitive health. Previous studies have established a clear link between insufficient sleep and increased risks of learning disorders, childhood obesity, anxiety, and attention disorders (ADHD).

However, in daily practice, these issues remain underestimated by families and sometimes even by healthcare professionals. Researchers from Brown University emphasize the need to disseminate clear but realistic recommendations. Simply stating “your child should sleep between 9 and 12 hours” is not enough, especially without specifying the implications in terms of environment, routine, and vigilance for signs of fatigue.

Diana S. Grigsby-Toussaint notes that simple actions can significantly improve sleep quality: establishing regular bedtime hours, limiting screen use in the evening, exposing children to natural light during the day, and promoting physical activity. These well-known tips, however, are still inconsistently applied.

The study also highlights the limitations of traditional tools. While parental questionnaires are useful, they are insufficient without objective indicators or educational support. In the long run, researchers advocate for integrating objective sleep measurement into regular pediatric monitoring, especially through lightweight devices like actigraphy.

This is a public health issue that requires both family awareness and adaptation of prevention policies. Better sleep is not just about duration but also about recognizing sleep as a fundamental pillar of child development.

Source: Aliana Rodriguez Acevedo et al., “Associations between objectively and subjectively measured sleep outcomes among elementary school children in Rhode Island,” Frontiers in Pediatrics (2025)