Many people take cocaine because it gives them a euphoric high and gives them more energy. Someone high on cocaine will stay up until the sun comes up, or perhaps for days at a time. Then there's the crash. He or she will sleep during the day or refuse to leave bed for more than 24 hours. Appetite Suppression: Cocaine usage reduces a person's appetite. They will usually eat less than they normally would so they can have more of the drug. This combination often leads to obesity. Mental Floss notes that "the effects of cocaine use may be visible to others," including "changes in mood, behavior, or ability to function safely." Cocaine affects everyone differently. Some people only feel its effects when they drink alcohol or take other drugs along with it. For others, it alone can be quite dangerous. There are several signs that someone may be using cocaine regularly, even if they aren't aware of it: - Changes in mood or behavior that don't make sense for one's age + mentality - Refusing to eat or sleep - Withdrawal symptoms such as tremors, diarrhea, and headaches - Being obsessed with money - Reluctance to socialize - Spreading rumors about friends or family - Stopping medical treatments - Spending more than you earn