As part of this autistic streak, I seem to have formalised my system of how to manage my finances. It's colour coded.

Red (Shit week). Spend as much money and sleep in. Loads.
Yellow (bit tired). Make sandwiches. Drink expensive coffees.
Green (energetic). Hyperdisciplined. Allowed to spend £1 a day- no skiving off work.

Damn- I must be bored!