It is relatively common for toddlers and older infants to experience episodes of waking up suddenly while screaming or crying, often linked to 'night terrors' or nightmare-like cycles. These are usually harmless and related to fatigue, overstimulation during the day, or normal brain development. Focus on keeping your child calm with gentle physical comfort until they settle, and avoid trying to fully 'wake' them. If these episodes become frequent or you remain concerned, consult your pediatrician to rule out discomfort from other factors like teething or overtiredness.