Some people watch the evening news, read a book, or soak in a warm bath. Use your bedroom only for sleeping. After turning off the light, give yourself about 15 minutes of trying to fall asleep. If you are still awake or if you lose your drowsiness, get up and go into another room until you feel sleepy again. Try not to worry about your sleep.
Some people find that playing mental games is helpful.
If you are so tired during the day that you cannot function normally and if this fatigue lasts for more than 2 or 3 weeks, you should see your family doctor or a sleep disorders specialist for a complete evaluation.