Englishspeaking, perhaps you should concern yourself with issues that impact you. My sleep schedule is mine, it suits my life and lifestyle. Years ago it was determined by my work schedule. If someone can keep their job after repeatedly arriving an hour late what concern of it is yours? Sure if you are depending on them taking their shift before you leave well that’s an issue to take up with management. The science of sleep has taught us many things since you were growing up in the 80s. We’ve learned that biologically teens have different sleep schedules, ergo public schools being responsive and delaying start times. We’ve also learned that parents ‘sleep training’ children can have long term impacts on how they sleep as adults.
Sometimes it’s good to take a step back and acknowledge the things you can control and the things you can’t. It may help you to sleep better.