A 32-year-old female with no psychiatric history presents with difficulty falling asleep for the past 3 months. She has tried sleep hygiene strategies without improvement. Her primary care provider previously started quetiapine 25 mg at bedtime, which she has been taking nightly for 6 months. She presents to the PMHNP for a medication review. Which of the following is the most important clinical concern about continuing quetiapine solely for insomnia in this patient?