If there ever is a constant about any teenager, it is that there will be issues around sleep. You mean that you thought you were done when you got your child to sleep through the night, somewhere back in the mists of time? No, you are not.
Now teenagers have a whole range of different problems with sleep than they ever had as a baby. But the 2 major issues are 1) going to sleep at a reasonable hour and 2) getting up in time to go to school. These morph into having enough rest in order not to fall asleep at school!!!
The teenage circadian clock is totally out of whack with the internal time clocks of any adult living around it. It's also totally out of synchronization with the time that they need to be in school! At 7 am, both of my kids would much rather be snuggled under the blankets than getting ready to go to school.
But at 10 pm? Neither of them is ready to go to sleep! Have you ever tried to tell a teenager to go to sleep? It's a lesson in futility! What you get back is lots of lip and a bunch of obstinateness- but they are nowhere near falling asleep! On the rare occasion, though, they actually listen to you. Then they are out like a light soon after and able to be nice to people all day. Did I forget to mention one of the other problems with a lack of sleep? It turns Rose into a screaming meanie!