Autism spectrum disorders (ASDs) are complex neurodevelopmental conditions characterized by deficits in social communication, delay in language and repetitive behaviors. Results from genetic studies reveal one pathway associated with susceptibility to ASDs, which includes synaptic cell adhesion molecules. Among the factors that could modulate this pathway are the genes controlling circadian rhythms. Sleep disorders and low melatonin levels are frequently observed in ASDs. Thus investigator will characterize the circadian rhythms of patients with ASD and search for circadian rhythms genes polymorphisms.

Inclusion Criteria:

• Patients with autistic spectrum disorders
• At least 6 years old
• Membership of a social security scheme
• Informed consent signed by the patient or both holders of parental authority if the subject is a minor, or by a guardian if the subject is under guardianship

Exclusion Criteria:

• Recent sleep symptoms
• Incapacity to keep rested for 24 hours