NPY and Anxiety: Laboratory studies confirmed that AC, by modulating HPA axis activity (58), regulating SNS function (59), balancing circadian rhythms, and influencing the cytokines (e.g., IL-1, IL-6) and neurotransmitters (e.g., neuropeptide Y, 5-hydroxytryptophan, melatonin, dopamine, norepinephrine, γ-aminobutyric acid, and β-endorphin) (60–62), was beneficial in improving sleep quality and anxiety levels in patients.