How much sleep do teenagers need?

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1. 1

   Sleep duration and compliance with sleep recommendations among Brazilian children and adolescents: an updated systematic review and meta-analysis.

   Jornal de pediatria (Maciel et al.)Published Sep 16, 2026Checked Oct 3, 2026

   “Random-effects meta-analyses were conducted, and subgroup analyses and meta-regression were used to explore heterogeneity.Summary of the findingsEighty-four studies involving 177,074 participants were included. The pooled prevalence of adequate sleep duration was 45% (95% CI, 29-62%) among preschoolers, 65% (95% CI, 55-74%) among school-age children, and 47% (95% CI, 40-55%) among adolescents. Mean sleep duration decreased with age, ranging from 10.50 h (95%CI, 9.85-11.20) in preschoolers to 7.77 h (95%CI, 7.42-8.12) in adolescents. Questionnaire-based measures yielded higher estimates than accelerometry, and prevalence varied by the sleep guideline adopted. Heterogeneity was substantial across analyses (I² > 98%).ConclusionsMany Brazilian children and adolescents do not achieve recommended sleep duration, which can compromise their health and development. Although the pooled estimates should be interpreted with caution due to substantial between-study heterogeneity, the findings highlight the need for standardized sleep assessment and reporting to improve comparability across studies and strengthen epidemiological surveillance and public health planning.”

2. 2

   Child and adolescent sleep duration recommendations in relation to psychological and somatic complaints based on data between 1985 and 2013 from 11 to 15 year-olds.

   Journal of adolescence (Norell-Clarke & Hagquist)Published Jul 11, 2018Checked Oct 3, 2026

   “PurposeTo investigate the association between sleep duration, sleep initiation difficulties and psychological and somatic complaints.MethodsWe used three cohorts of cross-sectional Swedish questionnaire data, from the Health Behaviours of School aged Children (1985/1986, 2005/2006, 2013/2014, n=>18 000, aged 11-15). Specific complaints (e.g. pain) and total complaint load were used as outcomes of sleep duration, sleep initiation difficulties and the combination of them both.ResultsSleeping less than recommended and sleep initiation difficulties were associated with increased odds of specific complaints and belonging to the group with the greatest complaint load. The combination of short sleep duration and sleep initiation difficulties were associated with higher odds than either sleep issue alone. No interaction effects between time and sleep variables were found regarding complaints.ConclusionsThe findings support recent sleep duration recommendations. Further, sleep issues warrant a broad health assessment as they indicate a high likelihood of other complaints.”

3. 3

   Structural Brain Correlates of Insufficient Sleep in Adolescents: A Narrative Review of MRI Evidence.

   Children (Basel, Switzerland) (Ananth et al.)Published Jul 8, 2026Checked Oct 4, 2026

   “While these biological and functional consequences of adolescent insufficient sleep have been addressed in prior reviews, no review has systematically examined the effects of insufficient sleep on structural brain development. Herein, we address this gap by reviewing the growing magnetic resonance imaging (MRI) literature linking adolescent sleep patterns to brain morphology. This review systematically synthesizes study findings from MRI sequences spanning diffusion tensor imaging (DTI), voxel-based morphometry, and structural volumetrics, including gray matter, white matter, and cortical thickness as it relates to sleep duration, sleep regularity, and sleep quality. In summary, results from these studies link insufficient sleep to measurable alterations in white matter microstructure, cortical thickness, and gray matter volume during adolescence, establishing detectable effects of brain morphology during a period of heightened neurobiological vulnerability. Protecting adolescent sleep represents an investment in both immediate well-being and long-term health outcomes extending into adulthood.”

4. 4

   Associations of reallocating time between physical activity, sedentary behavior, and sleep with mental health among Chinese adolescents: an isotemporal substitution analysis.

   Health and quality of life outcomes (Wu et al.)Published Aug 11, 2026Checked Oct 4, 2026

   “Reallocating PA to sleep also related to reduced depressive symptoms (B = -0.35, 95%CI = -0.42~-0.28) and anxiety symptoms (B = -0.24, 95%CI = -0.30~-0.18). Among adolescents with insufficient sleep, the associations were stronger when reallocating SB to sleep (for depression: B = -0.52, 95%CI = -0.64~-0.39; for anxiety: B = -0.40, 95%CI = -0.50~-0.28) or PA to sleep (for depression: B = -0.39, 95%CI = -0.50~-0.25; for anxiety: B = -0.32, 95%CI = -0.41~-0.19). Among those with sufficient sleep, reallocating SB to PA or sleep remained associated with lower depressive symptoms, but no significant association was observed for anxiety.ConclusionsReallocating time toward sleep and PA was associated with reduced depressive and anxiety symptoms, particularly among adolescents with insufficient sleep. Accounting for sleep status may help advance understanding of the associations between movement behavior reallocations and adolescent mental health.”

5. 5

   Patterns, determinants and associated outcomes with adolescent sleep health in Africa: A scoping review.

   PloS one (Olorunmoteni et al.)Published Sep 28, 2026Checked Oct 3, 2026

   “After screening 921 titles and abstracts and 78 full-text articles, we included 43 articles. There has been an increasing number of studies on adolescent sleep in Africa in the past 25 years. Cross-sectional studies were the most frequent design (67.4%). Most studies focused on sleep quantity and quality, with small sample sizes and scanty evidence on other aspects of sleep health. Inadequate weekday sleep duration was common among adolescents, often compensated by longer weekend sleep durations. Screen use at bedtime, sleeping environment, school schedules, and chronic medical conditions were the major risk factors for sleep disturbances. Poor sleep was associated with poor academic performance, depression, anxiety, and adverse cardiometabolic risk. This review shows a lack of studies on the multidimensional aspects of sleep health and the need for more objective sleep measures to better characterise the sleep health of adolescents in Africa. Larger studies with longitudinal and mixed-method designs are needed to drive the planning and execution of interventions to improve sleep health among African adolescents.”

6. 6

   Adolescent sleep (Wikipedia)

   WikipediaPublished Sep 29, 2026Checked Oct 3, 2026

   “Adolescent sleep is typically poor in duration and quality. Sleep duration and quality reduce to suboptimal levels, and sleep duration variability and latency increases during adolescence. Sleep recommendations suggest that adolescents (12-19) should obtain 6–12 hours of sleep per night. Additionally, there is a shift in the body's circadian rhythm such that sleep and wake timings become later during adolescence. Technology, social factors, and physical development are thought to contribute to poor sleep during this time. Poor sleep duration and quality in adolescents has been linked with altered brain functioning and development, poor mental and physical health, as well as higher rates of disease and mortality. The concerns surrounding poor sleep during adolescence has garnered significant public attention, especially concerning policies related to school start times. Many evidences suggest that sleep contributes positively to attention, behavior, and academic achievement for adolescents.”

7. 7

   Smartphone Acquisition and Use at Age 13 Years and Health Outcomes at Age 14 Years.

   JAMA pediatrics (Bren et al.)Published Aug 1, 2026Checked Oct 4, 2026

   “Among those who had acquired a smartphone, total smartphone time (standardized z score) was associated with depression (OR, 1.22; 95% CI, 1.01-1.80), obesity (OR, 1.34; 95% CI, 1.09-1.65), and insufficient sleep (OR, 1.28; 95% CI, 1.12-1.47). Placing smartphones outside the bedroom at bedtime was associated with lower odds of insufficient sleep (OR, 0.64; 95% CI, 0.47-0.87).Conclusions and relevanceThe results of this cohort study suggest that simply smartphone acquisition at age 13 years was not associated with depression or with obesity, but was associated with insufficient sleep at age 14 years; however, the amount of smartphone use was associated with higher odds of all 3 outcomes. Behavioral interventions like limiting smartphone time and keeping smartphones out of bedrooms at night may protect adolescents from potential adverse health outcomes. Findings offer insights to guide caregivers on adolescent smartphone use and inform policies aimed at protecting youth, such as delaying smartphone acquisition until age 13 years.”