HCRT and hypertensive disorder: Psychological stresses, e.g., anxiety, prolonged anger, mental stress, have long been considered as a contributing factor in developing hypertension (Zimmerman and Frohlich, 1990; Boone, 1991; Markovitz et al., 1993), and as discussed above orexin is involved in cardiovascular and respiratory responses to the acute stresses, e.g., panic, fear, drug or foot-shock induced, in animal models.