The document provides information about the history and effects of coffee. It states that coffee was first consumed in Ethiopia and Egypt in the 9th century before spreading to Europe in the 17th century, where opinions on it varied. While some doctors saw it as poisonous, others viewed it as acceptable to drink. Coffee can act as a poison in large doses for animals in experiments but is generally not dangerous for adults in normal amounts. The effects of coffee differ for each person, with some staying awake after drinking it before bed while others can drink it late and still sleep well.