This is a super interesting topic to contemplate on and think through.

Us humans tend to get bored pretty quickly with things. 

When we are working hard we tend to dream about chilling. 

When we are chilling, we tend to wonder about what we could do. 

When we are creating, we often find that process strenuous and want to ... chill again. 

Mind is at play and plays games on us. 

I would certainly recommend everyone follows these simple 10 steps to ensure they don't fall into the basic levels of depression. https://steemit.com/psychology/@jasongrant/10-simple-techniques-to-avoid-depression 

Thank you for sharing this insight and it gave me something to think about in terms of breakdown of how to spend a lifetime.