How common that a toddler refused to sleep? The bedtime selected for toddlers may not align with their internal body clock, leading to difficulties in settling for the night. The study examined the melatonin levels of 14 toddlers over six days and found that those with later melatonin rise times took longer to fall asleep. The research highlights the importance of a proper match between a toddler's bedtime and their natural melatonin production to reduce nighttime selling difficulties. Approximately 25% of toddlers and preschoolers experience problems selling after bedtime, which can include resistance, tantrums, and disturbances during the night. Sleep problems in early childhood can have long-term effects on emotional, behavioral, and cognitive development. How do you encourage your toddler to sleep? On next episode, how your toddlers learn new words rapidly?