Lunacy
The moon has a dramatic and inconvenient effect on your personality. During the full moon, you are extremely emotional and volatile (-2 to all Will and self-control rolls), while on nights of the new moon, you are very passive (you temporarily suffer from the Laziness disadvantage). While the moon is waxing, you are focused and pleasant; while it is waning, you are apathetic and a little touchy. Roleplay it!