[panax]

Also try a multi day hike through the wilderness to reset your circadian rhythm. This combines heavy levels of exercise, no phone access, and you wake up/sleep with sunrise/sunset.

To maintain your circadian rhythm during normal times, try to wake up and go to sleep at the same time every day and eat only during three meals per day at the same time each day, avoid caffeine later in the day and also follow the advice of others here. Keep the room you are going to sleep in very dark and quiet. Don't go to bed until you are ready to fall asleep - don't use tv/phone/computer in bed.