Overscheduling is, I think, the biggest issue. Most of the teens I worked with had something going on almost every night, to the point where rescheduling due to rain or heat was an absolute nightmare. Sports were the biggest offenders. They would often have gym/strength training in the morning and then practice in the evening, almost every evening. Keep in mind I'm mostly talking about summer, so the school year itself was worse. Those that had jobs would do them during the day.
It's completely different from when I graduated high school in '06. Very few sports took over your life in the summer. Football had practice in the mornings for part of the summer, and that's the only one I'm aware of. I don't get the emphasis on sports. I played some in school but never took them seriously and if they required that much time from me I would have been out.