Stress has some important concepts, which must be understood before one can learn how to cope with it. The first is to understand the physiological responses, which occur in response to stress. Typical physiological responses include increased blood pressure, increased heart rate, increased body temperature, etc. Headaches and disturbances in sleep patterns are also often witnessed. One important hormone, known as Cortisol, is secreted when we are stressed. It is an immunosuppressant, which means that those who are stressed often do not get sick. It is after they stopped being stressed that they become susceptible to illness. Students often experience this phenomenon after finals. Coping can be divided into two types of coping behaviors: adaptive and maladaptive behavior. Adaptive coping behaviors are healthy ways that a person deals with stress. Some adaptive behaviors could include exercising, meditation, communicating about the problem, etc. Maladaptive coping behaviors are negative ways that a person tries to control stress. Some of the most common maladaptive behaviors, especially in college students, are drug/substance abuse. This is achieved through excess partying where the consumption of alcohol and tobacco is common.