The Nurse Is Caring for a Young Adult Patient on the Medical-Surgical

The nurse is caring for a young adult patient on the medical-surgical unit.When doing midnight checks,she sees that the patient is awake and is doing a puzzle.What is the best explanation for the patient being awake?

A) The patient was waiting to talk with the nurse.
B) The patient misses his family and is lonely.
C) The patient's sleep-wake cycle preference is late evening.
D) The patient has been kept up with the noise on the unit.