Review: There’s no shortage of how-to books. There are books on how to get rich, how to be successful, how to become famous, how to be happy, how to win friends and influence people. Pink wrote a when-to book instead. When is a thoroughly researched book on chronobiology, the special effects of beginnings, midpoints and endings, and the stages of timing and synchronisation. Some people are larks, rise early and are obnoxiously high-spirited throughout the morning, but stumble through the afternoon. Some people are owls who go to bed in the early morning hours to sleep until noon. Should the workplace demand early attendance (it does), you recognize owls by their huge cups of coffee and their inability to talk without grumbling. Pink defines a third category for people who wake up moderately early, into which the majority of people falls. Your chronotype (which kind of bird you are) has huge effects on your mood and alertness throughout the day. Depending on what bird you are, and on the nature of the task, you will be more efficient at some things in the morning, while excel at other stuff in the afternoon. Most people, however, experience a significant trough in…