There are several cycles that have to do with sleep. The most easily recognizable one is our overall pattern of sleep and wakefulness. When we wake in the morning, we begin to build sleep 'debt'. This accumulates during the day, making us tired and wanting to go to bed at night. During the night's sleep, this debt gets paid off. If our sleep debt accumulates without getting paid off, we feel tired and groggy all day. We don't work at our optimum level - focus, creativity, production, decision-making all suffer. This is the first cycle - a period of long wakefulness followed by a period of long sleep. This is the cycle that keeps track of our sleep debt and it is this sleep debt I'd like to show you how to manage.