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Se calculan la dimensión fractal y el máximo exponente de Lyapunov para el electroencefalograma (EEG) humano durante el sueño. Para este propósito se supone que el EEG es generado por un sistema dinámico determinista no lineal. Se encuentran pequeñas diferencias entre algunas etapas de sueño. El método usado se describe detalladamente e incluye cómo encontrar el espectro de exponentes de Lyapunov, la entropía de Kolmogorov-Sinai y la dimensión de Lyapunov. También se discuten resultados que contradicen el origen exclusivamente determinístico no lineal que algunos autores le atribuyen al EEG.
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