I let them sleep. I work from home, so them sleeping until noon makes (or rather, made...they went back to school today!) my days quieter lol
DS18 spent his 4 years of high school in a constant state of motion and activity - on top of a vigorous class schedule, he also had football camp/preseason practices, then football workouts before school, after-school practice, games, Saturday meetings and recovery practice from 8:30am-noon, surgery his sophomore year with a 10-week recovery, then when football was over in Nov of his senior year, he had surgery 2 weeks later, a 10-week recovery, then got his first job, and had school, work, and lacrosse practice went from 7:30-10pm most nights of the week from Feb-June, so he would work from 4-8pm, then head right to lax practice on work nights. Also after football his senior year, he became a student athletic trainer, so when he wasn't working at his job, he usually stayed after school taping kids up or tending their injuries until his own Lax practice started at 7:30. There were many days he was at his HS from 5:45am-10:00pm.
So when he was actually able, and wanted to stay up and play video games until 2am, or Snapchat with his friends late into the night and sleep until noon the next day, we let him. He's got his...stuff....together, so it's never been an issue with us.