Infant temperament can predict behavior problems “Parents' interactions with their baby during the first year of life can predict the odds of behavior problems later on -- as can the baby's natural temperament, research suggests. The study, which followed nearly 1,900 children from infancy up to age 13, found that children whose mothers gave them plenty of intellectual stimulation in the first year of life -- reading to them, talking to them and taking them out of the house -- were less likely to have serious behavioral problems. At the same time, the odds of behavior problems were also linked to certain measures of the children's temperament during infancy -- such as how "fussy" they were, or whether they had a generally happy or more moody disposition.“

Sleep and behavioral/emotional problems in children: A population-based study (Sleep Medicine 2008) “Hyperactivity and conduct problems at school in boys were both associated with parental reports of bedtime resistance. Hyperactivity was also associated with longer sleep duration during weekends. Conduct and emotional problems in girls were associated with earlier bedtime during school days. Emotional problems in girls were also associated with longer sleep durations in school days and weekends.”

Emotional processing in male adolescents with childhood-onset conduct disorder. (J Child Psychol Psychiatry. 2008)