Sleep Restriction
Sleep restriction is a very effective way to quickly reestablish a regular sleeping routine. I generally suggest starting with Sleep Hygiene techniques first. If these are unsuccessful, then give sleep restriction a try. Though once your sleep pattern is reestablished, make sure to continue with good sleep hygiene, otherwise, you’ll be likely to slip right back into a dysfunction sleep pattern.
Dr. McDougall has an article outlining this technique. I would suggest though that people with Bipolar Mood Disorder not try sleep restriction.