Oh I only see it at the extremes, e.g. all-night flight, coding, or drinking will ruin my next 1-2 days, while in my 20s I'd be up and running almost immediatel

Oh I only see it at the extremes, e.g. all-night flight, coding, or drinking will ruin my next 1-2 days, while in my 20s I'd be up and running almost immediately. I also did gain a bunch of weight during covid and now I'm getting it back out though, so that also makes a diff. Edit: also, I'm comparing now with a full-time job + studying a language + free-time coding vs on my early 20s as an undergrad with all the free time in the world so...