What a great tool this is. Do your homework...
Here is the link to the book on Naikan by Carly's mentor in Japanese Psychology, Gregg.

How Marcus Aurelius Managed His Mind And What We Can Learn From It by Carly Taylor
11:02

Unlocking Brain Chemistry: The Power of Dopamine, Oxytocin, Serotonin & Endorphins
1:20:07

An eggcellent dietary habit to keep your brain healthy and help prevent Alzheimer's Disease
09:11