This work marks the first observation of crystallization of purely hydrophobic molecules inside the hydrophobic core of lipid membranes. While the investigated n-alkanes are still far shorter than actual polymers, this study provides a first impression of what to expect from the crystallization of long hydrophobic chains inside lipid bilayers. Furthermore, our results motivate studying more biologically relevant systems such as crystallizable drugs or triglycerides inside model cell membranes.