Diminishing Marginal Returns

From OrkDork.com.
http://okdork.com/2005/11/03/easy-way-to-explain-diminishing-marginal-returns/

I think I'm reaching the point of diminishing marginal returns in the semester. This is when the extra utility I'm gaining from learning is not worth the effort, time and thought I'm putting into it. I don't feel like moving anymore; my dance improvisations consist of me being very near to the floor, watching my hand move itself through the air. Drooped over one bent leg trying to balance (which is a difficult task in itself). I want to go to sleep.

Maybe it's all about sleep deprivation and rest. Whatever it is, I'm glad I finally reached this point because sometimes my voracious appetite for learning and experiencing scares me. It feels limitless. Now I know it isn't. I need to learn how to rest and get through these next couple of weeks.