While the patient's lower extremity, which is in a cast, is assessed, the patient tells the nurse about an inability to rest at night. The nurse disregards this information, thinking that no correlation has been noted between having a leg cast and developing restless sleep. Which action would have been best for the nurse to take?

A) Tell the patient to just focus on the leg and cast right now.
B) Document the sleep patterns and information in the patient's chart.
C) Explain that a more thorough assessment will be needed next shift.
D) Ask the patient about usual sleep patterns and the onset of having difficulty resting.