Is it possible for people with narcolepsy to lose weight? if so then is the weight loss as fast as normal people?

Yes: While some people with narcolepsy can have a problem being overweight, they should not have much more problem losing weight compared to those without the condition. Because narcolepsy can make you very sleepy and tired, there can be a problem having enough time or energy to exercise. As with anyone else, a healthy diet can help. See your doctor if you have specific concerns.