sorry, nothing about our bodies tells me they're this inflexible. i wonder if the "nighttime chronotypes" controlled for things that actually would influence it, like light exposure. regardless, one of the things that worked best for me was rigging a bright light to dawn gradually at a early hour, and cutting off my bright light exposure at a early hour. even if i have a "night chronotype" it's still possible to "trick" it into thinking i'm sleeping at a different time.

tbh i'm a bit suspicious that there are 5am natural sleepers. being basically nocturnal doesn't sound natural or healthy. and given the proven effects of lack of sunlight on mental health that should be fixed regardless of work timing.

i personally hate the phrase "the science" with a passion, but can you link me what you're referencing? cause nothing suggests that they're this "inflexible".

ngl everyone i've talked to who has a "nighttime chronotype" is actually just doomscrolling until 3AM then complaining "oh i can't sleep early". they typically keep bright light on late and use blackout curtains in the morning. no wonder their bodies don't work in a natural, normal circadian rhythm when they do this kinda stuff.