Acknowledgments

Presented MP parametrization of sleep recordings was possible only owing to a long-term cooperation with prof. W. Szelenberger, dr. M. Skalski, dr. S. Niemcewicz and dr. W. Androsiuk from the Medical University of Warsaw. Epileptic EEG displayed in Figure 5 courtesy of prof. P. J. Franaszczuk and prof. G. K. Bergey from Johns Hopkins University. Figure 6 is based on data recorded by prof. E. F. Kelly from the University of North Carolina. We acknowledge the assistance of our colleagues from the Warsaw University: J. Ginter, D. Ircha and J. Zygierewicz. This work was supported by the Polish Committee for Scientific Research grant 8T11E01416.