Well, there is, and it is designed to put you asleep with the setting of the sun and wake you up with its rising. Any Boy Scout or outdoorsman could tell you that some of the most restful and natural sleep they've had is outside in the open air on a nice camping trip.
The reason people have such terrible sleep schedules and feel as groggy as they do when they awake is because of the difference in their external reality and their natural body clock. When we allow the two to function in sync, we experience the most beneficial sleep.
The only way to synchronize your internal clock and external reality is to live by natural light. That is why camping is so effective at giving us healthy sleep. Our bodies have the opportunity to follow the pattern of the setting and dawning of the sun.
