Is your child falling asleep with technology aglow? Children's eyes are not fully developed, and research shows their eyes are more sensitive to light than the eyes of adults are. This can affect the brain and disrupt circadian rhythms (the biological clock). Lack of sleep can contribute to excessive tiredness at the end of the school day, grade slippage, conduct problems, loss of interest in other pursuits, depression, and an increase in suicide risk. Make rules early on concerning the use of digital media. Doing so later won't be easy. Try keeping a basket in a family area where everyone (including you!) puts their cell phone or tablets before bedtime, and model healthy behaviors like limiting screen time and good sleep hygiene.