Generally I don"€™t remember my dreams, and to judge by the few that I do remember I am rather glad that I don"€™t. Nor do I believe, pace Freud, that they are the royal road to the unconscious, still less that they are auguries of the future. On the contrary, I think that they are the effect on the brain of the digestive products of heavy meals taken too late at night. However, I have to admit that this opinion may be the consequence of selection bias: the few dreams that I remember tend to be those that follow such heavy meals. Physiologists tell us that we all dream every night, ...