Dizziness and lightheadedness may be related to insomnia, or may be caused by high blood pressure, mental disorders and other reasons. 1. Insomnia: If the recent irregular work and rest, often excessive late night, or poor mood, excessive thinking, etc., are easy to interfere with sleep, causing insomnia, resulting in the brain can not get enough rest, it may cause dizziness, heaviness, lethargy, may also be accompanied by drowsiness, mental lethargy and other symptoms. 2. High blood pressure: When the blood pressure is elevated, especially when the blood pressure is elevated to a large extent, the pressure in the cerebral blood vessels is obviously elevated, which may cause dizziness, heaviness and drowsiness, and may also be accompanied by headache, nausea and other symptoms. 3. Mental disorders: commonly found in depression, anxiety disorders and other diseases, these patients are plagued by long-term bad moods, easily combined with sleep disorders, may cause dizziness, heaviness, drowsiness. Dizziness, heaviness and lethargy may also be related to other factors, if the symptoms persist, it should be taken seriously, seek medical attention as soon as possible, diagnose the cause, and then be guided by the doctor for treatment.