Nightmares: Nightmares occur from time to time in many children, but they are most common in preschoolers (children aged 3 to 6 years) because this is the age at which normal fears develop. Practicing good sleep hygiene and other strategies can help eliminate nightmares.
Anxiety Disorders Anxiety as a medical condition is characterized by worry, fear, nervousness, shortness of breath, sleep problems and other symptoms. Diarrhea, tremors, and rapid heart rate are some physical symptoms of severe anxiety, which may arise from a mental or physical condition, drug use, or some combination of these causes. Treatment can include medication and psychotherapy.