He suddenly remembered the "Compendium of Materia Medica" written by the old Li Shizhen.
The book contained methods for using various Chinese herbal medicines and information on the regions where they grew.
But what nobody knew was that there was actually another volume to the "Compendium of Materia Medica".
It was divided into two sections: one on Chinese herbs and the other on mental strategies.
As for now, only the former had been left behind.
But Su Wen could recall some of the contents from the latter.
The mental strategies section of the "Compendium of Materia Medica" included sentences that could help a person fall into a peaceful sleep.
Of course, their effect was to rest the mind with closed eyes, which in modern terms would be similar to a lullaby, without any particularly miraculous effects.
But at this moment, it could be put to use.
Su Wen murmured the words from the "Compendium of Materia Medica".
