http://www.med.umich.edu/yourchild/topic... http://www.med.umich.edu/yourchild/topics/sleep.htm University of Michigan Health System: Sleep Problems if your pre-teen is getting enough sleep University of Michigan Health System University of Michigan Health Systems: Sleep Problems University of Michigan Health Center: Problemas para dormir http://www.med.umich.edu/yourchild/topics/sleep.htm med.umich.edu http://www.med.umich.edu/yourchild/topics/sleep.htm University of Michigan Health System: Sleep Problems The University of Michigan Health System University of Michigan Health System: Sleep Problems University of Michigan Health System: Sleep Problems University of Michigan Health System: Sleep Problems dimming the lights in your home around bedtime researchers from the University of Michigan University of Michigan Health System: Sleep Problems troubled sleep are two different things University of Michigan Health System: Sleep Problems expertos, University of Michigan Health System University of Michigan Health System: Sleep Problems University of Michigan Health System: Sleep Problems http://www.med.umich.edu/yourchild/topics/sleep.htm Sleep Problems: Your Child http://www.med.umich.edu/yourchild/topics/sleep.htm Sleep Problems: Your Child http://www.med.umich.edu/yourchild/topics/sleep.htm children need as many as 16 hours of sleep Med.UMich.edu: Sleep Problems University of Michigan Health System University of Michigan Health System: Sleep Problems Univeristy of Michigan Healthy System: Sleep Problems In another study University of Michigan: Sleep Problems: Your Child Sleep Problems in Children University of Michigan Health System Sleep Problems: Your Child sleep problems. University of Michigan Health System: Sleep Problems Med.Umich.edu University of Michigan Health System: Sleep Problems Universidad de Michigan Health System: Problemas del sueño