., Toussaint, M., Luthringer, R., Macher, J.P. (1996) Low- dimensional dynamic self-organization in delta-sleep: effect of partial sleep deprivation Biol Cybern 74:395-403 Chaitin, G.J. (1974) Information theoretical computational complexity. IEEE Trans. Inform. Theory 1T20:10-15. Chay, T.R., Rinzel, J. (19