Welcome to the official list of things thatchartInstance Caffeine Injections are allowed on Mondays.
However, due to the Tuesday-ification of the calendar, all other days of the week are subject to Weekday Exceptionalities.
Don't forget to request extra Caffeine if you're feeling particularly Exceptionally Tired.
Or, if you're feeling Exceptionally Caffeinated, you may wish to request extra Sleep.