On the 1 AM rounds, the nurse finds a patient awake and frustrated that she cannot go to sleep. The nurse administers an ordered hypnotic to help the patient sleep. Two hours later, the nurse finds the patient out of bed, full of energy, cleaning her room, and singing. Which of the following describes what is happening?
a. An allergic reaction
b. An idiosyncratic response
c. A teratogenic effect
d. A synergistic effect