What specific actions should I consider taking the night before undergoing a PET scan to ensure the most accurate results? Are there particular dietary restrictions I need to be cognizant of, or perhaps lifestyle adjustments that could impact the efficacy of the procedure? Should I refrain from consuming certain foods or beverages in order to better prepare my body for the imaging process? Moreover, does the timing of my last meal play a critical role in the ultimate clarity of the scan? Are there guidelines regarding hydration that I ought to follow, or is it imperative to avoid any substances that might interfere with the radioactive tracers? Lastly, could factors such as stress levels or sleep quality the night before the appointment influence the outcome? All these considerations seem essential for optimizing the integrity of the scan results, and I wonder what would be the best course of action to take.