For another thing, I think I can be mentally “tired” but not physically tired, and vice-versa. But be warned that it’s a bit tricky to think about this, because unpleasant physical exertion generally involves both attention control and motor control. Thus, “willpower” can somewhat substitute for “physical energy” and vice-versa. See “Example 1” here.
Hmm, correlation may not imply causation here but when I am exerting more willpower and orienting my life with unusual amount of stress, I often end up getting more hungry compared to normal. It might be due to some third cause of getting up early, doing exercise on time, being more punctual and prompt etc.
Hmm, correlation may not imply causation here but when I am exerting more willpower and orienting my life with unusual amount of stress, I often end up getting more hungry compared to normal. It might be due to some third cause of getting up early, doing exercise on time, being more punctual and prompt etc.