The first examples of regular and singular self-similar solutions of the 3-d nonlinear Schroedinger equation for potential vector field are found explicitly. Regular solutions relate to the process of the `singularities ` formation. Singular solutions relate to an early evolution of the `singularities`. Together, the solutions describe behaviour of Langmuir wave field in the spatiotemporal vicinities of its`singularities` and provide an effective mechanism of energy dissipation from the Langmuir condensate. 5 refs.; 1 fig.