Final answer:
The nurse explains that the child's behavior is common and usually temporary.
Step-by-step explanation:
The nurse responds to the parents by saying, "It is common for children to have trouble relaxing, and this behavior is the result. It's usually temporary." The nurse is addressing the parents' concern about their child waking up several times during the night crying out but not really being awake. The nurse reassures the parents that this behavior is common and usually temporary, indicating that it is a normal part of a child's development.