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).