Insomnia is a sleep disorder that is characterized by the inability to fall asleep, having extreme difficulty falling asleep, or problems staying asleep. People who suffer from insomnia often wake up and can never get back to sleep or are never able to get to sleep in the first place. As a result, they often feel a lack of energy which can interfere with a person’s daily routine. It can also affect your mood, quality of life, and overall health. It is very important for people to get at least seven to eight hours of sleep a night. It is estimated that about 30 percent to 50 percent of people in the United States will have insomnia at some point in their life.