Effect of blue light from electronic devices on melatonin and sleep/wake rhythms in high school children

INTERVENTION: The following parameters will be measured: sleep wake behavior, light exposure, screen use, and melatonin onset. The 30 infrequent screen users from the present study will be compared to the 30 frequent screen users in the regular screen use condition in study NTR 6712. CONDITION: Late sleep phase ; ; PRIMARY OUTCOME: o Sleep onset time; ; o Wake‐up time; ; o Mid‐sleep time; ; o Sleep duration; ; o Melatonin onset; SECONDARY OUTCOME: o Total energy intake ; ; o Snacking frequency ; INCLUSION CRITERIA: • Age 11‐17 • Going to high school • Fluent Dutch speaking • Infrequent screen use