It is rare for head banging, or other sleep-related rhythmic movements, to cause enough trouble to be classified as a disorder. However, in 1% to 3% of infants, rhythmic sleep movements are considered a disorder because they disturb sleep, cause daytime symptoms, or result in injury. When severe enough to be classified as a disorder, research suggests that sleep-related rhythmic movements may be associated with other problems. These include: - Attention-deficit/hyperactivity disorder (ADHD) - Autism - Intellectual and learning disabilities - Mood and anxiety disorders Other sleep disorders, such as restless leg syndrome and obstructive sleep apnea