Lead exposure in early childhood is associated with increased risk for sleep problems and excessive daytime sleepiness in later childhood, according to research from the University of Pennsylvania, US.

The findingswhich will be published in the December but are already available online, are based on data from a longitudinal study of more than 1400 Chinese children that began in 2004 to examine the influence of lead exposure on neurocognitive, behavioural and health outcomes in children and adolescents.

‘Little is known about the impact of heavy metals exposure on children’s sleep, but the study’s findings highlight that environmental toxins—such as lead—are important paediatric risk factors for sleep disturbance,’ said principal investigator Jianghong Liu. ‘Lead exposure is preventable and treatable, but if left unchecked can result in irreversible neurological damage.’

Past research has linked lead poisoning in children has been to violent crime and brain damage. This study is the first longitudinal, population-based study to investigate the connection between lead exposure and sleep.

This article is reproduced with permission from Chemistry World. The article was first published on November 18, 2015.