According to the National Heart, Lung, and Blood Institute, the causes of insomnia depends on its kind. Insomnia can either be acute or chronic. Acute insomnia is often caused by stress, family pressures, or a traumatic event. Chronic insomnia can be a symptom or side effect of certain medical conditions, medicines, or sleep-disorders. However, the Mayo Clinic staff and NHS said that the common causes of insomnia are stress, psychiatric problems, medications, medical conditions, drug and alcohol abuse, use of nicotine, too much caffeine intake, and a change in environment or work schedule. Aging can also be associated with insomnia. As a person gets older, changes occur that may affect that person’s sleep. That person may experience a change in sleeping pattern: as a person gets older, his/her internal clock advances which mean that one gets tired earlier in the evening and wakes up earlier in the morning. As a person gets older, he/she may be less physically and socially active and more likely to take a daily nap due to a change in activity. In terms of health: As a person gets older, he/she is more prone to diseases that may interfere with one’s sleep such as sleep-disorders, back pains, arthritis, and psychological problems. In addition, older people use more prescription drugs than younger people do. This increases the chance of insomnia caused by medications.