Children’s sleep has both environmental and genetic influences, with stressful family environmental factors like household
chaos and marital conflict associated with sleep duration and quality (El‐Sheikh, Buckhalt, Mize, & Acebo, 2006; Fiese, Winter,
Sliwinski, & Anbar, 2007). However, it is less clear whether sibling conflict is related to sleep duration and children’s
sleep problems (e.g., nighttime wakings,…