A client has been prescribed zolpidem (Ambien) for insomnia. The client's spouse reports that the patient drives at night but does not remember it in the morning. Which of the following explains this behavior?

This is a side effect of this drug which will go away after 2 weeks.

This is a complex sleep behavior with memory loss associated with this drug.

This is a severe allergic reaction of this drug.

This means the drug is at toxic levels in your system.