The causes of dizziness after waking up include lack of sleep, insufficient blood supply to the brain and elevated blood pressure. 1. Lack of sleep: Lack of sleep due to emotional tension, mental anxiety and other reasons, so that the brain does not get rest, after waking up, you will be dizzy and lightheaded. It is recommended to release pressure, exercise reasonably, and get enough rest to relieve the symptoms. 2. Insufficient blood supply to the brain: the vertebral artery is one of the main blood vessels supplying blood to the brain, and when it is compressed or deformed, it will cause insufficient blood supply to the brain. Diabetes, vascular sclerosis, etc. can also cause insufficient blood supply to the brain, resulting in dizziness and lightheadedness after waking up. 3. Elevated blood pressure: blood pressure is most likely to rise in the early morning hours, medically known as early morning hypertension. If the blood pressure is elevated, it will also appear after getting up to feel dizzy and not awake. Caused by dizziness after waking up may have other reasons, it is recommended that patients pay attention, if the symptoms are not relieved for a long time need to consult a doctor in a timely manner, clear reasons, targeted treatment.