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Aim To study an association between sleeping (SP) and behavioural disorders (BP) in preterm children to catch-up growth and weight. Design and Methods 105 children (8.5–10 years): 39 born preterm ( Results The Preterm group displayed a higher incidence of SP (23% vs 10% and 3% p=0.026) and BP (38% vs 10% and 8%, p=0.001). ○ Preterm AGA no BP• Preterm AGA with BP ⋄ Control no BP The black dotted line: Controls without BP (r=0.69, p At 9 years, preterm AGA with BP (n=13) had lower length SDS (p=0.003), weight SDS (p=0.006) and head circumference SDS and a tendency to lower height catch-up (p=0.09) compared to preterm AGA without BP (n=18). Fasting levels of IGF-I, insulin and leptin were lower in all Preterms with BP. Preterms with SP (n=8) had a lower height catch-up (p=0.009) compared to those without SP (n=30). Conclusion Children born preterm have an increased risk for SP and BP. These disorders are associated with reduced catch up in height.