The common causes of sleeplessness in the elderly are: 1. The pineal gland produces melatonin in normal people, which has the function of maintaining sleep rhythms. As the elderly age, melatonin production gradually decreases and causes difficulty in falling asleep. Some elderly people have delayed peak melatonin secretion, which also affects sleep. 2, the sleep demand time of the elderly is significantly shorter, the elderly sleep too early at night, disrupting the normal physiological sleep cycle, sleeping too early, waking up too early. 3, some trivial matters during the day caused by mood anxiety, there are many elderly people will occur anxiety, depression and affect sleep. Some have difficulty falling asleep, some wake up early and have difficulty falling asleep again after waking up. 4, the drugs taken may interfere with sleep, the elderly often have underlying diseases taking certain drugs, and some drugs may cause abnormal sleep adverse reactions. 5, organic diseases caused by sleep abnormalities, elderly male patients often have prostate enlargement, diabetic patients and patients with renal insufficiency, often appear to increase nocturia and affect sleep. 6, some elderly people may have heart disease, general muscle or joint pain, restless legs syndrome and other physical pain and personal discomfort can affect sleep.