A 62-year-old female is referred to the PMHNP by her primary care provider, who writes in the referral: 'Patient has been on quetiapine 25 mg at bedtime for 2 years for insomnia. Please continue her antipsychotic and manage her newly diagnosed generalized anxiety disorder.' The patient has no history of psychosis, bipolar disorder, or any condition requiring antipsychotic treatment. She reports the quetiapine helps her sleep and she has had no psychiatric symptoms beyond insomnia and recent anxiety. Which of the following is the most accurate clinical interpretation of this patient's quetiapine use?