Fast from complaining or criticizing. If you normally watch television every night, for Lent sit quietly or spend time with a family member or friend. In fact, why not give up T.V. entirely for Lent. If you're always tired and cranky, maybe your Lenten discipline could be to get enough rest and to be generally more happy. If you're a workaholic, maybe you could take a day off and just waste some time.
Workaholism suggests a couple of things.
It could be that the workaholic values money more than relationships. The workaholic never has time to develop deep and meaningful relationships because work beckons them away. It keeps us from being close to anyone, even our families. It could be that workaholics don't honestly believe they are worth anything unless they are working. Often there are self-esteem issues behind the addiction to work.