I discovered that my motivation to save the world is greatly affected by my physical energy level.

In the morning, after coffee, I’m full of confidence and nothing can stop me from bringing about world peace.  In the late evening after gym, I’m certain I’m powerless to do anything for humanity, I should instead just spend the rest of my life watching TV and playing golf.
Which is why I decided I should get more sleep.  I’m doing this for humanity.