In school-age children, sleep curtailment is associated with deficits in multiple neurobehavioural domains. Alarmingly, on school days, 64.5% of school-age children in Singapore sleep less than the minimum recommended duration of 8 hours, and they typically attempt to pay their sleep debt by extending their time in bed during weekends. However, empirical evidence from adolescents and adults suggest that sleep extension for one or two nights may not be sufficient to fully reverse the neurobehavioural impairments caused by repeated sleep restriction on weeknights. To what extent sleep extension on weekends can facilitate the recovery of cognitive functions and mood remains unexplored in children, particularly when sleep restriction is recurrent across weeks. The study aims to investigate the neurobehavioural deficits and recovery dynamics of two weeks of sleep restriction on weekdays and extension on weekends among school-age children.