Let us mark ourselves for 3 weeks every nights, of daily activities of that day, what mark they get from 1 to 10, on the three independent factors MUST, CAN, WANT.
Then we calculate the average and the standard deviation of each marked factor of the sample.
If the result is a triad with a high score on the WANT and satisfactory score on the can, e.g. (MUST=6.5, CAN=5, WANT=8.5) , then your days are close to happiness.
But if they are with low score on the WANT, high score in the MUST etc (e.g. MUST=10 CAN=3 WANT=2 ) then your days are close to unhappiness.