Redness and burning of the face when you wake up from sleep. Causes include localized skin allergies, fever, mumps, psychological factors and so on. 1. Localized skin allergy: If the skin allergic reaction is triggered by a variety of allergens, the skin will be red, swollen and hot with itchy symptoms. 2. Fever: If the fever is caused by various factors such as catching a cold while sleeping, then the phenomenon of redness and heat on the face will also occur when sleeping. 3. Mumps: When the mumps virus infects the parotid gland, it can cause inflammation and swelling of the parotid gland, which makes the face red and hot. 4. Psychological factors: if the patient has hysteria and other mental illnesses, these diseases can trigger endocrine disorders, so the face red hot. Finally, when the phenomenon of sleeping up with a red hot face persists without relief, please consult a doctor in time and follow the doctor’s instructions for treatment.