The document discusses how sleep and productivity are linked. It notes that many successful entrepreneurs wake up early, between 5-6am, and start their day with a workout. They then report being more productive. The document also introduces Project Addapp, a startup that aims to link personal data trackers to help people better understand factors that affect their sleep and productivity. It encourages the reader to measure aspects of their life to optimize productivity, happiness, and understand how different areas are interrelated.