Those studies do seem to indicate so. However, they do not take into account multiple other factors that could make an individual wanting to, consciously or not

Those studies do seem to indicate so. However, they do not take into account multiple other factors that could make an individual wanting to, consciously or not, become a night owl. The same is true for all a person's preferences, although we don't have enough theoretical nor practical knowledge on the topic. Also, the way they are phrased, particularly the one by Kanazawa and Perina, seem to indicate a causal link between the two states. Correlation does not imply causation. Furthermore, how many studies indicate the opposite point? I'd be interested in a comparison of results.