The present study sought to describe the profile of sleep disturbance reported in children with autistic spectrum disorders (ASDs) and to document any sleep disorders underlying reports of sleeplessness. Sixty-nine children aged 5 to 16 years (mean 9 years 4 months, SD 2 years 7 months; 14 females) with an ASD were assessed by detailed sleep histories taken from parents, the Simonds and Parraga Sleep Questionnaire, a 2-week sleep diary, and actigraphs worn by the child for five nights. Parent-reported sleeplessness featured prominently (64%). Sleep disorders underlying the sleeplessness were most commonly behavioural (i.e. to do with inappropriate sleep-related behaviours), although sleep-wake cycle disorders and anxiety-related problems were also seen. In addition, the sleeplessness patterns of a large minority of children could not be classified by conventional diagnostic criteria. Sleep patterns measured objectively did not differ between those children with or without reported sleeplessness, but the sleep quality of all children seemed to be compromised compared with normal values.

Sleep problems are common in children with severe learning difficulties. Children with sleep problems are reported to have more behaviour problems, but daytime challenging behaviour has not been examined specifically. The current study was concerned with associations between sleep problems and challenging behaviour, as well as describing other clinical features of the childrens' sleep, as reported by parents. All children in the series showed some form of sleep disturbance, with settling problems, night waking and early waking in 44% of the sample. Children with sleep problems showed significantly more types of challenging behaviour and challenging behaviour of a greater severity than children without sleep problems, resulting in management difficulties for carers throughout the 24-h period. Reasons for this association and suggestions for intervention are discussed.

Psychological outcome was poor for a minority of children and associated with disability, especially for travel. There were significant family consequences. There is a need for changes in clinical care to prevent, identify and treat distressing and disabling problems.

The present study investigates the occurrence of daytime behaviour problems and maternal stress in a group of children with Down's syndrome (DS) compared with a group of their non-intellectually disabled siblings, a group of non-intellectually disabled children from the general population and a group of children with an intellectual disability other than Down's syndrome. The Aberrant Behavior Checklist (ABC) and the Malaise Inventory were completed by the mothers. Associations between daytime behaviour problems and maternal stress were also explored. Overall, the children with DS and the children with other intellectual disabilities showed significantly higher rates of behavioural disturbance on all five of the ABC subscales (Irritability, Lethargy, Stereotypies, Hyperactivity and Inappropriate Speech) and on the Total ABC score. However, the children with other intellectual disabilities also showed significantly higher scores than the children with DS on four of the ABC subscales: Irritability, Lethargy, Stereotypies and Hyperactivity, as well as the Total ABC score. The siblings and children from the general population showed very similar behaviour scores. A number of significant age and sex differences were found in the occurrence of daytime behaviour problems. Maternal stress was significantly higher in the group with other forms of intellectual disability than the other three groups, and a number of significant associations were found between parental ratings of daytime behaviour problems and maternal stress in all four samples. The implications of the findings are discussed, including the need for early assessment to minimize adverse effects on the child's development and on family life.

By means of parental questionnaires, sleep disturbances were assessed in 79 schoolchildren with epilepsy (mean age 10.12, range 5-16 years) for comparisons with 73 healthy control children matched for gender and to within a maximum of 6 months of age. The daytime behaviour of the children with epilepsy was also assessed by questionnaire. The children with epilepsy were considered representative of such children under general paediatric care. Sleep disturbance was classified into five basic types (poor quality sleep, anxieties about sleep, disturbances during sleep, symptoms of disordered breathing during sleep and short duration sleep) and the behaviour questionnaire provided scores on five factors (conduct problems, hyperactivity, attention problems, anxiety and physical complaints). Compared with normal controls children with epilepsy showed much higher rates of sleep disorders, particularly poor quality sleep and anxieties about sleep. In children aged 5-11 years associations were found between disturbed daytime behaviour and sleep problems, particularly poor quality sleep. There was also a significant association between seizure frequency and anxieties about sleeping. This study highlights the potentially serious psychological and other developmental implications of persistent sleep disturbance to children with epilepsy, and the need for further research on specific types of epilepsy with careful identification of the nature of both sleep disturbance and related psychological dysfunction.