Can you tell me how to re-set my circadian rhythm?

Exercise in day: One of the best ways to reset your circadian rhythm (e.g. after jet-lag or shift work), is to make sure you exercise, at least 15 minutes during the daylight. Ideally >6 hours before bed time. Also, wake up at your desired time, don't take naps, and avoid caffeine 6-8 hours before bedtime. Avoid T.V. in bedroom, to prevent insomnia.