Healthy nutrition and sports make you slimmer and more hardy, but the body also needs proper sleep to consolidate the positive effect. After all, it affects weight, mental state and reduces the risk of diseases - from colds to cancer. But the modern world challenges us in the form of constant stress at work, a sedentary lifestyle and continuous presence in front of a computer or smartphone screen. Professor of Sweden's oldest Uppsala University and sleep neuroscientist Christian Benedict, in a conversation with journalist Minna Thunberger, enthusiastically and knowledgeably tells readers how insomnia increases unhealthy appetite, how amazing dreams help improve understanding of their own feelings, how deep phases strengthen immunity and neural connections in the brain. This book alternates scientific facts with practical advice that will allow you to better understand what sleep is and make it deeper to become happier and more cheerful.