| Recruiting | N/A | 300 | Europe | Sleep extension | University of Copenhagen, Novo Nordisk Foundation (NNF), Faculty of Health, Medicine and Life Sciences, Maastricht University, Center for Obesity Research & Education, Temple University, Danish Research Centre for Magnetic Resonance, University of Southern Denmark | Sleep Duration, Child Obesity, Child Development, Child Behavior | 12/26 | 12/27 | | |