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I would suggest looking into the medical research on the downsides of getting little sleep. After a single night of low sleep (and 4 hours is low), even though you'll feel fine, your body will not process a lot of things the way it normally should (e.g. insulin response is significantly degraded).

Over time, it supposedly significantly increases the likelihood of certain diseases/conditions.

Peter Attia was one of those people who got by with little sleep, and for years, well into his medical career, was dismissive of those who preached the importance of 8 hours of sleep a day. He then looked into the research, and completely changed his mind:

https://peterattiamd.com/category/sleep/

by andai7 hours ago|

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When I was looking into the dual n back stuff a while back, I remember reading one report where the person would feel subjectively fine when sleep deprived, but his nback score would go way down.

In other words it's possible to "feel fine" on little sleep and yet be significantly cognitively impaired. Worth measuring that, if possible.

(It might have been Gwern, he's got a big page on the subject.)

by kanbankaren8 hours ago|

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0 regrets now doesn't mean 0 regrets decades later.

by glerk8 hours ago|

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That's totally fair, and I'll cross that bridge when I get there like everyone else :)

My philosophy is: either I'll live to benefit from technology that can repair the damage caused by aging, in which case health micro-optimizations early in life are not that important, OR this won't be achieved within my lifetime, in which case I prefer a short life with concentrated happiness, vitality and intensity in my youth.

by kanbankaren8 hours ago|

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There is some new scientific finding that in deep sleep, fluids from the brain drain out and if that flushing doesn't happen, it might lead to Alzheimer's disease.

You should at least monitor your deep sleep using a smartwatch. Less than 1.5 hours and I would be worried.

by glerk7 hours ago|

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Thanks, I am aware of reduced cerebrospinal fluid flushing as well as the increased neural inflammation in general and I am trying to compensate for that as best as I can.

I am not too worried about Alzheimer's as it tends to start pretty late in life (I think average onset is around mid-60s?). If I get that and we don't have a reliable cure by then, I wouldn't really mind ending it quickly after getting the diagnosis. I'm a bit more worried about heart disease as that tends to hit earlier.

by currymj8 hours ago|

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I believe you, but if you are ever in a position of authority, please don't expect anyone else to function well on 4 hours of sleep.

by Loic8 hours ago|

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You are at one edge of the gaussian curve of the sleep requirements of the human species. The problem is that many think they belong there, but are not. Enjoy what you have and let the haters hate.