**6. Conclusions**

Sleep disorders comorbid to ADHD may aggravate cognitive and behavioral impairment in affected children.

They also severely affect parental negative attitudes and wellbeing.

Addressing and fostering a correct sleep diagnosis may add to the therapeutic benefit obtainable in ADHD children. In fact, a differential diagnosis according to subgroups of children in relation to their phenotypic sleep expression, allows to better characterize children and parental needs and to implement oriented therapeutic options. Future research needs to address better care and divulgate easy diagnostic means (Holter-PSG and selfadministered questionnaires) for a home-based monitoring of children in their natural environment.
