Leucippus, that sleep is only of the body; but when the smaller particles cause excessive evaporation from the soul's heat, this makes death; but these affections of death and sleep are of the body, not of the soul.

Empedocles, that death is nothing else but separation of those fiery parts by which man is composed, and according to this sentiment both body and soul die; but sleep is only a smaller separation of the fiery qualities..