Their inner struggle is most obvious in their vitality, as both the Sun and the Moon strongly influence the vitality. They have many ups and downs, and it is hard to know if it is physical or emotional. In fact, it's likely both. These people might spend a week working hard, and the following week they lack motivation and find it hard to accomplish much. Their energy fluctuates more than most people, and it is very much a reflection of what is going on inside.
The messages they received in their early lives in terms of what was expected of them were conflicting, and even opposite. Some people born under the Full Moon viewed their parents as two very different and separate individuals who each wanted something very different from their child. Their parents or parent figures "stood for" two very different things, and their child internalized this. There may have been some emotional frustration in connection with the father and a stifling of the go by the mother.
It is hard for Sun opposition Moon people to find happiness within themselves. They tend to look outside of themselves for fulfillment. They are inclined to form serious relationships at an early age, simply because of this tendency to try to find an answer to happiness from an "other". They are prone to divorce, partly because of this prematurity, and partly because their needs are complicated. Full Moon people are also more apt to seek counseling because of this need to find answers.
These people appear to be very self-aware. They entertain a myriad of different points of view and perspectives. They are excellent psychologists and are able to read character and uncover motivations--but with an important caveat: if they are too emotionally close to the situation, they fumble. The truth is, although they appear to know much about how people tick, they spend a good part of their lives uncovering more of themselves and learning about themselves. Generally, this is done through comparisons or through the mirror of relationships.
They can most certainly frustrate the people who are close to them with their indecisiveness and frequent changes of mind (and of heart). A word to those who deal with this on a day-to-day basis: their changes of heart are not a form of insincerity--they are the result of an internal struggle that is very real and very confusing to live with! Sun opposition Moon people can be temperamental, insecure, and very sensitive. The ability to put themselves in someone else's shoes, and to consider other points of view, is a true asset. However, at some point in their lives, they need to uncover what it is they truly want. This comes easy to New Moon people, and can be a life-long struggle for Full Moon people. On the other hand, it is extremely easy for a Full Moon personality to understand others' points of view--something that doesn't come as easily to a New Moon personality. Sun opposition Moon people are generally interesting and complex. Born under a Full Moon, they can be a bit "loony", perhaps manifesting itself in a unique sense of humor.
Look for a planet that might trine and sextile the Sun-Moon opposition for a way to release the tension the opposition creates. Somehow, some way, through that planet, its sign, and its house position, the Sun opposition Moon person can find an "answer" to the struggle. Look also to the sign polarity involved for more details of the struggle. If it's Aries and Libra, for example, there is a conflict between two equal drives to be independent and to depend on others.
Some Famous People with Sun Opposition Moon: Lisa Bonet (the aspect is exact, or partial), Alicia Witt.
People born with a Sun-Moon tension can spend much of their lives struggling to balance the principles of the Sun and the Moon within their personalities, and will bring this struggle to some degree into their relationships. The urge to form meaningful relationships is generally powerful, but relationships can be as much of a struggle to these natives as the inner conflict is to themselves. This inner conflict occurs with the square, opposition, and quincunx. The desire to find meaningful relationships is stronger than it is when the natal Sun and Moon form a sextile or trine, and early relationships in particular can be challenging until the stressful aspects are recognized as an inner tension.