Ruhr University study finds short tablet use does not disrupt toddler sleep

A study published in Pediatrics Open Science by researchers at Ruhr University Bochum suggests that 15 minutes of watching cartoons on a tablet approximately one hour before bedtime does not inhibit melatonin secretion or disrupt sleep quality in children aged 15 to 24 months.

The study involved 32 infants who viewed the same Peppa Pig story either via a tablet or a physical picture book. Researchers measured melatonin levels through saliva samples and monitored sleep patterns using ankle bracelets. Results showed that melatonin levels rose at similar rates in both scenarios, and there were no significant differences in sleep duration or the time taken to fall asleep.

While the findings challenge the common assumption that blue light from screens immediately suppresses melatonin in toddlers, researchers noted limitations. The exposure duration was brief, and previous studies on adults showed melatonin suppression only after two hours of screen time. Additionally, the World Health Organization continues to recommend that children under two years old avoid screen exposure, noting that screens may still affect sleep through stimulating content.