When I was a trucker my wake-up times would vary a lot, maybe 5 am for a 6 o’clock start one day then 8 the next day as my drop didn’t open until 9, then 7 for an 8 o’clock drop etc. then back to 5 again.

I used to regularly wake up a few minutes before my alarm no matter what time I set it to.

In later years despite having more regular hours I seem to have lost this ability. I suspect I could retrain myself again but in my current situation it feels like more effort than it’s worth. Dunno what changed to make me lose this ability.

He semi-recommends careful melatonin supplementation to make up for the damage of the modern environment.

That idea is quite similar to primal supplementation that Mark recommends. “Grok didn’t take supplements so why should I?” — because Grok had access to more nutrient-rich foods and a less toxic environment. Modern supplemntation in theory helps close that gap.

The same idea is possible with melatonin. Our environments are flooded with “toxic” levels of artificial light, which inhibits melatonin production. Melatonin supplementation might help close that gap. But because melatonin is a hormone, supplementation is tricky and may or may not be safe in the long-run due to how the body was designed to self-regulate its own melatonin levels.