HCRTR1 (hypocretin receptor 1) is a G-protein coupled receptor that binds orexin-A with high affinity and orexin-B with lower affinity 1. The receptor mediates its activity through G(q)-protein-coupled signaling pathways, activating the phosphatidylinositol-calcium second messenger system and promoting beta-arrestin recruitment for receptor internalization 1. HCRTR1 is primarily associated with regulation of motivation, reward, and autonomic functions, while its counterpart HCRTR2 is more strongly linked to sleep-wake control 1. The receptor plays significant roles in various physiological processes including feeding behavior, cardiovascular regulation, and stress response 23. In disease contexts, HCRTR1 genetic variants are associated with reward sensitivity in a gender-dependent manner and have been linked to aggressive behavior 4. The receptor shows clinical relevance in multiple conditions: variants affect anesthesia response and hemodynamic stability 3, contribute to migraine susceptibility 5, and influence daytime napping patterns with potential cardiometabolic implications 6. Therapeutically, HCRTR1 represents an important drug target, with selective antagonists showing promise for treating obesity by modulating feeding behavior 2, and orexin-A demonstrating neuroprotective effects in cerebral ischemia through anti-inflammatory and anti-apoptotic mechanisms 7.