This is a linkpost for https://medium.com/@owenshen/the-ancient-god-who-rules-high-school-e0645b100ae6
Everyone has trouble falling asleep when they're going to bed earlier than usual, at first. If you keep at it and are consistent about avoiding things like bright artificial lights, high general arousal, strong drugs like coffee and other adverse environmental cues later in the day, you'll fall asleep and your "chronotype" will shift back as intended.
So how about some actual evidence for these claims?
I mean, the medical profession has terms like "advanced sleep phase disorder" and "delayed sleep phase disorder" and "non-24-hour sleep-wake disorder" and seems to take the view that "just go to bed later/earlier/regularly and it'll sort itself out" is not a helpful response. Now, obviously, those are just doctors; what do they know? But it might be helpful to know how it is you know that they're wrong.
Or, when you say "Anyone can ...", is it possible that you don't actually mean anyone?