Adjusting your sleep schedule can be tough, and helping your kids do the same (whether for daylight saving time, back-to-school, or any other life changes) can feel even more challenging.

Key points. A new study on adolescent phone use found that kids spend 1.5-2 hours per day on their phones at school. The most used apps are messages, Instagram, video streaming, audio, and email.

These numbers also correlate to starting school at a younger age, consequently putting more strain on eyes to focus on school work. Kids in Asia, for example, can start as early as age 2.