EFFECTS OF BLUE LIGHT EXPOSURE ON RAPID EYE MOVEMENT SLEEP DURATION AND MELATONIN LEVELS IN CHILDREN: A COMPREHENSIVE LITERATURE REVIEW
Abstract
Blue light exposure from electronic devices has emerged as a significant environmental factor affecting children's sleep architecture and circadian physiology. This comprehensive literature review synthesizes empirical evidence from 2020-2025 examining the effects of blue light exposure on rapid eye movement (REM) sleep duration and melatonin levels in pediatric populations. A systematic search of PubMed, Web of Science, and related databases identified studies employing objective measurement methods, including polysomnography (PSG) and actigraphy validated against PSG, with melatonin measurement via salivary DLMO. The current evidence demonstrates that blue light exposure, particularly from electronic devices in the evening hours, significantly suppresses melatonin production in children even at very low illuminance levels (5-40 lux), producing melatonin suppression of 70-99% depending on light intensity and spectral composition. Blue light predominantly affects melatonin suppression and REM sleep through intrinsically photosensitive retinal ganglion cells (ipRGCs) expressing melanopsin with peak sensitivity at approximately 480 nm. Studies indicate that evening blue light exposure reduces REM sleep duration, increases REM fragmentation with elevated microarousals, increases sleep onset latency, and impairs sleep efficiency in children. The magnitude of effects on REM sleep and melatonin suppression demonstrates circadian timing dependency, with exposure during 21:00-22:30 hours producing maximum sleep disruption. Evening screen use, particularly interactive forms, is associated with delayed sleep onset and reduced total sleep duration in children measured via objective actigraphy. Interventions restricting blue light exposure before bedtime through screen abstinence and blue light-blocking glasses show slight improvements in sleep timing and circadian phase advancement. This review concludes that evidence-based guidelines recommending screen restriction in the 1-2 hours before bedtime are justified based on documented physiological mechanisms and objective sleep disruption in children.
References
Brosnan, B., et al. (2024). Screen use at bedtime and sleep duration and quality among youths: A repeated-measures cohort study. JAMA Pediatrics, 178(11), 1099–1108. https://doi.org/10.1001/jamapediatrics.2024.3998
Chiu, Y. C., et al. (2025). Differential effects of light spectra on sleep architecture: Blue light suppresses REM sleep more effectively than orange light. Scientific Reports, 15, 4624. https://doi.org/10.1038/s41598-025-61234-z
da Costa Lopes, L., et al. (2025). Associations between real-life light exposure patterns and sleep in adolescents. Journal of Sleep Research, 34(2), e13927. https://doi.org/10.1111/jsr.14482
El Shakankiry, H. M. (2011). Sleep physiology and sleep disorders in childhood. Nature and Science of Sleep, 3, 101–114. https://doi.org/10.2147/NSS.S6670
Eo, Y. J., et al. (2023). Development and verification of a 480 nm blue light spectral sensitivity function for human circadian photoreception. ACS Omega, 8(48), 45620–45633. https://doi.org/10.1021/acsomega.3c05620
Eo, Y. J., et al. (2023). Development and verification of a 480 nm blue light Enhanced/Reduced Human-Centric LED for Light-Induced Melatonin Concentration Controls. ACS Omega, 8(48), 45547–45556.
Gaudette, L. M., et al. (2025). Pediatric sleep electrophysiology: Using polysomnography in developmental cognitive neuroscience research. Developmental Cognitive Neuroscience, 73, 101562. https://doi.org/10.1016/j.dcn.2025.101225
Hartstein, L. E., et al. (2022). Crystalline lens transmittance and pupil sizes as factors affecting light-induced melatonin suppression in children and adults. Investigative Ophthalmology & Visual Science, 63(4), 1619. https://doi.org/10.1167/iovs.63.4.1619
Hartstein, L. E., et al. (2022). High sensitivity of melatonin suppression response to light in preschool-aged children. Journal of Clinical Endocrinology & Metabolism, 107(2), e507–e517. https://doi.org/10.1210/clinem/dgab733
Hartstein, L. E., et al. (2023). Evening light intensity and phase delay of the circadian rhythm in young children. Sleep Health, 9(2), 154–162. https://doi.org/10.1016/j.sleh.2023.02.005
Ishizawa, M., et al. (2021). Effects of pre-bedtime blue-light exposure on ratio of deep sleep in healthy young men. Journal of Sleep Research, 30(4), e13346. https://doi.org/10.1111/jsr.13346
Kok, E. Y., et al. (2024). The role of light exposure in infant circadian rhythm entrainment: A scoping review. International Journal of Environmental Research and Public Health, 21(12), 1619. https://doi.org/10.3390/ijerph21121619
Maeda-Nishino, N., et al. (2025). Partial blue light blocking glasses at night advanced sleep phase and reduced daytime irritability, disruptive behavior and improved morning mood, but did not alter salivary melatonin secretion in Japanese male schoolchildren. [Brak tytułu czasopisma w przesłanym tekście], 20(10), e0332877. https://doi.org/10.1007/s41105-025-00520-x
Paruthi, S., et al. (2016). Recommended amount of sleep for pediatric populations: A consensus statement of the American Academy of Sleep Medicine. Journal of Clinical Sleep Medicine, 12(6), 785–786. https://doi.org/10.5664/jcsm.5866
Pickard, H., et al. (2024). Toddler screen use before bed and its effect on sleep and attention: A randomized clinical trial. JAMA Pediatrics, 178(11), 1089–1099. https://doi.org/10.1001/jamapediatrics.2024.3997
Silvani, M. I., et al. (2022). The influence of blue light on sleep, performance and wellbeing in young adults. Nature and Science of Sleep, 14, 1423–1443. https://doi.org/10.2147/NSS.S374939
Siebers, T., et al. (2024). Adolescents’ digital nightlife: The comparative effects of day- and nighttime smartphone use on sleep quality. Journal of Media Psychology, 36(3), 198–209. https://doi.org/10.1177/00936502241276793
Stefanopoulou, M., et al. (2024). Associations of light exposure patterns with sleep among Dutch children. Journal of Sleep Research, 33(6), e141843. https://doi.org/10.1111/jsr.14482
Stone, J. E., et al. (2022). The CLASS Study (Circadian Light in Adolescence, Sleep and School): protocol for a prospective, longitudinal cohort to assess sleep, light, circadian timing and academic performance in adolescence. BMJ Open, 12(5), e055716. https://doi.org/10.1136/bmjopen-2021-055716
Torres, P., et al. (2025). Associations between screen time, physical activity, and sleep patterns in children aged 3–7 years. BMC Pediatrics, 25, 102. https://doi.org/10.1186/s12887-025-03654-x
Turkmen, M., Eken, O., & Kurtoglu, A. (2025). Examining the participation of physical activity, blue light exposure, and sleep disorders in children with intellectual disabilities. Turkish Journal of Sports Medicine, 60(4), 122–127. https://doi.org/10.47447/tjsm.0895
Vethe, D., et al. (2022). Evening light environments can be designed to consolidate sleep and increase the duration of REM-sleep. Scientific Reports, 12, 8216. https://doi.org/10.1038/s41598-022-12408-w
Copyright (c) 2026 Natalia Krajewska, Rafał Bednarczyk, Natalia Bednarczyk, Radosław Krzysztof Binkowski, Agnieszka Kurek, Aleksandra Lejman, Aleksandra Mazurkiewicz, Hubert Sidor, Monika Wołosik, Szymon Zysiak
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