Abstract
Medical interview is the most important method to identify sleep disorders at usual medical examinations. Sleep disorders can be classified to insomnia, hypersomnia and rhythm disorders. Insomnia is the most common disorders and the cause of insomnia is various and the treatment is different. The case of senior insomnia, nocturnal frequent urination, decreased melatonin insomnia, REM sleep behavior disorder, hypothyroidism, and sleep apnea syndrome, which are the common insomnia, are reported and explained in this chapter.