Main point: Everyone has a personal definition of words like “productive”, “busy”, “hard work”, but progress is driven by the evolution/expansion of these definitions.
Yes, here comes another obvious “wisdom” of the relativist variety.
I like to use sport for analogy, because sport somehow boils down the basic struggles of life into a concrete measurable game of skill and chance. So let’s talk about the treadmill (here’s me running on a treadmill). I used to think that an 8 minute mile was hard. I mean I have friends that are runners and can keep a 5-6 minute mile pace for several miles, but I never even acknowledged that as reality.
To me an 8 minute mile was something I could do, but would have to put in a lot of “hard work”. Anything faster than that was for physical freaks, who I completely ignored in my analysis. The reality however is that those people struggled with an 8 minute mile as well at some point in their life. But unlike me, they did not settle with this limit. They changed their definition of “hard” first to 7 minutes, then to 6, and finally to bellow 5.
I did the same a couple years back with a 6 minute mile. I just one day decided that I will run at a 6 minute mile pace for as long as I could. I would not quit until my body completely quit. It was torture, but I actually did it.
I think the same is true with everything we undertake in life. I too often settle for my idea of what is “hard work” and don’t try to push the limit. But that’s where growth happens: trying to do the things that seems obviously impossible. It turns out that some of them are actually possible.
Since I don’t run much, and suffer through it every time I do run, I like to use running as an indicator of my mental toughness (or lack thereof). For this reason, I hope to one day be able to run a 5 minute mile. Of course, my real goals are all surrounding research and academia, but those are a lot more difficult to put into words and numbers than the time it takes to run a mile.
Sleep is fundamentally a social phenomena in that when (and how long) you sleep is often determined by the social norms, personal responsibilities, and the people in your life. The more freedom you have in this regard, the more freedom you have to experiment with different sleeping patterns.