Having a late night hook up does not necessarily increase or decrease the likelihood of developing a meaningful relationship. It really depends on the individuals and how they choose to interact with each other after the hook up. If both parties are interested in building something more meaningful, they may be able to use this experience as an opportunity to learn more about one another and build trust. However, if either person is not interested in pursuing something deeper, then it is unlikely that a meaningful relationship will occur from this encounter.