[W +(D-d)] x TQ divided by M x NA.
W is the weather, D is debt minus the money (d) you earned in January. T is the time since Christmas and Q, the time since you lapsed back into your bad habits. Divide that by M, your low motivational level, and NA, the need to take action.
I believe this condition only applied to the 4 season countries. So if you are living in or nearby the equator, lucky you.
But isn’t it also weird today is the 21st birthday of our beloved Macintosh?