Samurai were special sake adherents, who in the heat of violent orgies often went beyond forgetting the true purpose of their path which they followed. And after such forgetfulness during the next day they had heart palpitations, urge to vomit, headache, and other signs of severe hangover. Especially for all that have taken the path of bushi, the book was published entitled as "Sake drinking rules for samurai". It is unlikely that the author of this book knew that the main cause of all these torments for the best representatives of the samurai class is acetaldehyde, a toxic alcohol decomposition product, but his following recommendations for the hangover severity reduction appear to be relevant even now.
you need to drink by straightening your back and taking the right posture;
you need to relax, calm down, straighten your back and sing a long song to eliminate the residual signs of intoxication;
you must eat sweet food (for example, SIRUKO - sweet red bean soup with rice dumplings) before, during and after the drinking of sake.