Chronic insomnia is more common in the
elderly and can be caused by psychiatric
disorders, such as conditioned insomnia, alcohol and substance abuse, depression and anxiety, chronic pain, nocturia, and many medical disorders such as congestive heart failure, hyperthyroidism, rheumatologic diseases, dementia, Parkinson's disease, chronic obstructive pulmonary disease (COPD), asthma, and gastroesophageal reflux disease (GERD).