Many people will have headaches and dizziness when they do not sleep well, mainly consider the following reasons: 1. When patients do not sleep well the nerves and cells of the brain do not get sufficient rest, which can easily cause brain nerve dysfunction, and patients will show symptoms of dizziness and headaches. 2. Poor rest can easily lead to increased blood pressure fluctuations, which can also cause patients to have headaches. 3. Long-term nerve function Weakness and poor sleep also tend to lead to headache, poor spirit, muscle strength and other adverse reactions. 4, headache when patients do not sleep well may have a certain relationship with cervical spondylosis, when patients do not sleep well is likely to lead to neck, shoulder and back muscles in a state of tension, contraction, there will be a certain pull on the head muscles, resulting in the symptoms of headache.