During a home visit, the nurse assesses a client with Alzheimer's disease who recently started a new prescription for rivastigmine. The caregiver reports that the client seems to be thinking more clearly but is not sleeping well at night. Which action should the nurse take?

Explain to the caregiver that insomnia is a common and temporary side effect when the medication is first started.

Advise the caregiver that the purpose of the medication is to promote sleep, so a change in medication may be needed.

Instruct the caregiver to withhold the medication until the dosage can be decreased to ensure the client's safety.

Notify the healthcare provider that the dosage of the medication may need to be increased to manage the client's insomnia.