Demographic and medical information
Children’s demographic and medical information was abstracted from their medical records. This included sex, age, body mass index (BMI), date of diagnosis, tumor type and tumor location. Any treatment that had taken place before the time of assessment was collected, including neurosurgery, start of radiotherapy, and start of chemotherapy, as well as complications of hydrocephalus and epilepsy. Patients and their parents provided information on pre-existing sleep problems, use of sleep medication during the seven day sleep assessment, daytime naps and whether they slept at home or in the hospital during the assessment. Lastly, through a general survey, parents provided sociodemographic information.