Anemia may lead to insomnia. Because there are few red blood cells, the blood does not contain enough oxygen and the oxygen supply to the brain decreases, which affects the nervous system and can lead to excessive dreams and insomnia. The severity of insomnia symptoms depends on the rate of anemia, the degree of anemia, and the body’s ability to compensate. Early symptoms of anemia include dizziness, weakness, and sleepiness. The most prominent symptom is a pale complexion due to insufficient blood supply. This mild form of anemia does not usually lead to insomnia. Severe anemia leads to insufficient blood supply to the heart as well as the brain. The body’s central nervous system can not get enough oxygen, a series of central nervous system symptoms, and brain cells are the most sensitive to hypoxia, brain hypoxia patients may have headaches, dizziness, tinnitus, insomnia and so on. Insomnia caused by anemia, it is recommended to actively treat anemia, after the anemia symptoms improve, insomnia symptoms will improve.