Used in neuroscience research to measure orexin (also known as hypocretin) levels in biological samples such as cerebrospinal fluid, plasma, or cell culture supernatants. Particularly valuable in studies related to sleep disorders like narcolepsy, where orexin deficiency is a key diagnostic marker. Enables researchers to investigate the role of orexin in appetite regulation, energy balance, and arousal pathways. The kit provides a sensitive and specific method for quantifying orexin A or B peptides, supporting drug development and biomarker validation in neurological and metabolic disease research.