Setting your sleep and wake times on a regular, rhythmic pattern can help you improve your circadian immensly.
Being out to the sun during daylight enhances sleep rhythm.
Cut down on any use of screens an hour before bedtime, and keep the lights dim when you try to your sleep.
Get your room to the optimal temperature regime. It puts you to sleep right away. The optimal temperature for sleeping is 60 to 68 degrees Fahrenheit.
Prior to sleeping, eat lightly and avoid beverages that contain caffeine. They can be a cause of sleep disruption.