After taking a nap, my head is dizzy

This manifestation may be related to the following factors: the first point is that the patient may not be in a particularly good position when sleeping, causing tension in the neck and head muscles and fascia, thus showing ischemia, causing the release of inflammatory mediators, showing tension headaches, which may be manifested as drowsy feelings. The second case may also be that the sleeping environment is not very good, the air is not particularly fresh, showing the lack of oxygen in the brain will also show this symptom. The third case may also be that the sleep process shows a cold, causing some respiratory infections, causing fever, thus causing a feeling of drowsiness in the head.