When my oldest daughter was an infant, I read a book called "Solve Your Child's Sleep Problems." Can't remember who wrote it, but it was my bible when my kids were small. At around 8 months old my oldest would not stay asleep because she used a pacifier. When the pacifier would fall out of her mouth, she would wake up, unable to find it and put it back in her mouth. Then, of course, she would cry and I would wake up and go put it back in her mouth.
The book told how to teach the child how to self-soothe and gave step-by-step instructions on how to go about it. It took a couple nights and I slept in the hallway outside her door and listened to her scream and cry, but it worked. There was a chart in it that mapped out the hours children should sleep depending on their age. Sleep requirement is high in infant years, backed off in the tween years and then was high again in the teen years. Bedtime and sleep is something I've always had under control with my kids. I've always insisted they go to bed, stay in bed, and get a good night's sleep.
When my youngest was born, she didn't ever want to sleep or take a nap. I think she thought she was going to miss something. Even when she was an infant, sleep was not her friend. Everything that worked with my oldest, did not work with my youngest. She didn't even use a pacifier. She just wanted to stay awake with the action. She is still like this, even at 13.
She started her life as part of the night action. After she was born, she couldn't warm up, so they put her on my naked chest, covered us with warming blankets and had us under a warming light. After we brought her home, she couldn't lay down flat because she had reflux. Attempts to jack up her mattress were unsuccessful, as she just ended up in a heap at the bottom of the crib. So we had to hold her while she slept for about two months. She also developed jaundice and was hooked to a 6 foot cable for a week that delivered the phototherapy lights she needed from a belt under her pajamas. We called her out little glow worm.
This is a child who still does not want to sleep. In the summer I have to tell her to go to bed at a certain hour or she'll still be awake when her father goes to work at 4:00am.
So when I informed her last night I read this book that said teenagers needed 10 hours of sleep. She crumpled on my bedroom floor in peals of laughter. I'm not sure why that was so funny. Maybe because my delivery was "Ireadabookthatsaidteensneed8hoursofsleep!" When she recovered her composure she informed me, in much the same way I delivered my information, that she stumbled upon a site on the internet that said teens' biological clocks are such that they go to bed late and rise late and that there is nothing we can do to change it; the teen will just go to bed and lay there awake.
I told her to go to bed.