Used in neuroscience and sleep disorder research to quantify levels of orexin-A, a neuropeptide involved in regulating wakefulness and appetite. Helps investigate conditions like narcolepsy, where orexin signaling is impaired. Enables researchers to measure orexin-A concentrations in cerebrospinal fluid or tissue samples with high sensitivity and specificity. Supports studies on the role of the orexin system in sleep-wake cycles, energy balance, and addiction. Widely used in preclinical studies and drug development targeting orexin receptors.