Often times not having the discipline to get up when you need to is the problem. And the solution is to tough it out.
So while you look for the cause, also work against the symptom.
For instance, quitting alcohol.
You need to quit, as well as try to look for the reason you're escaping into it. Do both.
But really, what negative external could be more intractable than the hordes of Germans lining upon the Rhine and Danube? And yet MA rose up each morning to deal with them as seen in that documentary with Russel Crowe
However, if you consider that we co-evolved with our environment and all of its challenges and constraints, then our desires and how much we feel them are simply the result of optimizing our survival over hundreds and thousands of generations.
E.g. the 'difficulty' of our environment is a 50. We have to have a desire of 51+ to survive: a will to live. The 'lazy' spiders all had <50 and no longer exist.
Therefore, if we change environments to something much easier to live in, then our desires are kind of vestigial optimizations that may not provide the kind of guidance on the optimal way to survive in the new environment - they may take hundreds or thousands of generations to unwind. Modern civilization in particular has created such a massive shift in challenges and resource availability that it's not hard to find examples of this.
E.g. we have a strong desire to rest even when we don't need it because we co-evolved in environments where rest was scarce (due to need to survive), so when we had the opportunity we took it. Same with food: food used to be scarce, so we needed a strong desire to get it, but now food is abundant and we still have that desire and wind up eating too much.
In both circumstances, the environment was the pace-setter, but thats now changed, so we need to be our own pace-setter.
So… not what Jocko is talking about?
https://www.nsw.navy.mil/NSW/SEAL-Ethos/
If "the logos" (fate) declared Jocko to be a warrior, then it is well within his nature to be disciplined.
> At dawn, when you have trouble getting out of bed, tell yourself: “I have to go to work — as a human being. What do I have to complain of, if I’m going to do what I was born for — the things I was brought into the world to do? Or is this what I was created for? To huddle under the blankets and stay warm?”
> Don’t you see the plants, the birds, the ants and spiders and bees going about their individual tasks, putting the world in order, as best they can? And you’re not willing to do your job as a human being? Why aren’t you running to do what your nature demands?
Not even "discipline", but what is "nature".