Numbness of the tongue after waking up from sleep may be due to ischemic cerebrovascular disease or due to vertebral artery-type cervical spondylosis. 1. Ischemic cerebrovascular disease: usually seen in small lacunar infarcts or infarcts of the brain stem, due to ischemia may cause numbness of the tongue, accompanied by dizziness, numbness of the limbs and other clinical manifestations of neurological deficits, which may be manifested as numbness of the tongue after waking up, and need to be diagnosed by CT or MRI of the head. 2. Vertebral artery-type cervical spondylosis: cervical spondylosis leads to herniated cervical intervertebral discs, and when sleeping, the herniated cervical vertebrae compress the vertebral arteries, affecting their blood supply, so that they can’t provide sufficient blood supply to the brainstem. The patient may experience symptoms of brainstem ischemia, such as numbness of the tongue. The diagnosis can be confirmed by CT or MRI of the cervical spine. If there is numbness of the tongue after waking up, it is recommended to consult a doctor in time to complete the relevant examinations and follow the doctor’s instructions to carry out targeted treatment.