Does sodium form complexes like transition metal ions? I realise that there is a similar question here Difference between sodium ion and a transition metal ion dissolving in water? and it seems to answer my question, however I was reading about how aluminion ions form complexes in water, and aluminium is not a transition metal. So how can aluminium form complexes like transition metal ions, but sodium does not?
Although less common than transition metal complexes, sodium does form complexes with some ligands, particularly oxygen based ligands.

Aqua complexes are formed in aqueous solution, the most common being $\ce{[Na(H2O)6]+}$.

Sodium forms many complexes with crown ethers, cryptands and other related ligands. For example, 15-crown-5: