Autonomic Baby Evaluation (AuBE) study is a prospective observational follow-up of a single-center cohort to assess in a population of consecutive term and preterm newborns the main effect of the autonomic maturation profile during the first two years of life on psychometric development assessed at 3 years. Normative data at each stage of sleep should be well defined with this longitudinal study that requires a complex and careful analysis of cardiac and electroencephalographic physiological signals.