A toddler may wake up crying at night because their sleep is disrupted by separation anxiety, teething pain, hunger, illness, overtiredness, or a developmental change. The question “why does my toddler wake up crying?” often comes up when a child wakes during a light sleep cycle, feels confused, and cannot settle without help.
Night terrors, nightmares, and changes in routine can also cause sudden crying or screaming. A steady bedtime routine, a calm response, and brief comfort can help, but fever, pain, breathing issues, or repeated intense episodes should be discussed with a pediatrician.