"I've always suffered from poor sleep. It is one of the fundamental facts of my life." This is the opening of a book about the experience of those who, like the author, have trouble sleeping. It doesn't deal with extreme insomnia, but rather with a persistent difficulty sleeping which, while allowing us to live relatively normal lives, colours our relationships with night, with day, with work, with the people around us and results in feelings of loneliness, failure and frustration.

'El mal dormir' ('Poor Sleep') is a luminous meditation on a source of disruption as relevant as it is mysterious, which tries to show an unknown side of existence to those who don't have problems with their sleep and offer those who do the subtle relief of having it acknowledged.