Comment by lanfeust6

This is a shifted circadian rhythm. If you get up late, you'll be sleepy late; additionally, blue-light exposure at night (from screens) suppresses melatonin production and can delay onset. The fix isn't to "go to bed early" first, it's to get up early and get exposure to sunlight then and during the day, and the sleep pressure in the evening will follow in kind. This is further facilitated by giving yourself time in the evening to wind-down away from screens, by having a ritual/routine (an hour at least) such as preparing breakfast, reading, doing yoga, whatever.

Think of it like jet lag. If you travel to the other side of the world, you rapidly shift schedule in accordance with your habits (the timing of your meals, light exposure, activity, socializing etc), whether that be night or day. These inputs more than ever influence morning-ness or evening-ness qua chronotype, with the advent of limitless evening light and entertainment.