Nose bleeds while sleeping

Hi, welcome to the ehealth forum and I am glad to help you.
You seem concerned about periodic nose bleeds with mild headache between left nostril and left eye with about six episodes in the last 4 months.
A common cause of bloody nose and headache is a blow to the head. If you've been hit in the head, consider seeing a doctor right away.
Sometimes, due to a blow to the head or other reasons, the large blood vessels in the back of the nose can be damaged. This is called a posterior nosebleed. Posterior nosebleed is especially common in the elderly, or those with high blood pressure. You can be tipped off that this is going on if the bleeding is coming from the back of the nose and the blood is coming from both nostrils. Sometimes the blood may even run down the back of your throat.
The other causes of nose bleeds such as dryness, nose picking, drugs like aspirin etc. may also be ruled out. Nosebleeds and bruising can be early signs of leukemia. Nosebleeds can also be a sign of blood clotting disorders and nasal tumors (both cancerous and non-cancerous).
You must consult otorhinolaryngologist for definitive diagnosis and treatment as the same cannot be made online.
Hope this helps. Take care.