Elderly people’s drowsiness may be caused by environmental factors, brain disease factors, other disease factors and other reasons. 1. Environmental factors: Environmental factors are mostly seen in the elderly who have been in a closed environment for a long time, who have been inactive for a long time and whose life is relatively monotonous, and who are prone to drowsiness. 2. Brain disease factors: when the elderly appear drowsiness symptoms, should consider whether there are brain diseases, such as cerebral atrophy, cerebral arteriosclerosis or cerebral blood supply and other diseases may cause the elderly to appear drowsy state. 3. Other disease factors: in general, disease-induced dysphoria is also a common cause of drowsiness in the elderly. Elderly people who are physically weak, especially those who suffer from hypothyroidism or lung infections, will experience mental depression and drowsiness at an early stage. When sleepiness occurs in the elderly, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, and to use the correct medication under the guidance of the doctor.