My personality is dependent on the amount of biological wastes in my brain

 my brain thinks it's a good idea because it's too tired to think some steps farther ahead. 

This is observing how I think in the morning vs at night. Whenever I reflect back on the night's thinking and how much morning justin thinks it's stupid.  

If you believe in the role of sleep and good health (preventing the atrophy of the cardiovascular system and maintaining the skeletal, and muscular systems, avoiding the elements the body cannot process well). 

I need Deep Work, Cal Newport, for me means having a good portion of my work memory and long-term memory allocated to the task. Its in the Working Memory more powerful processing  can occur.