You find yourself wide awake after 5 hours of sleep and feel ready to get up and meet the challenges of the day. However, the rest of the neighbourhood is still sleeping. You wonder why it is that others need to sleep longer than you. The duration of our sleep may be of concern to some of us and begs the question: “how much sleep is ‘normal’ and how much do I need to be healthy. Although an apparently simple question, there is no simple answer!