I am sneezing blood in my sleep and i don’t know why!

Patient: Hi doctor, Its normal for me to sneeze all the time because I am very allergic to smoke, dust and heavy perfume. I have Asthma . this morning when I woke up and I felt fine and I did my normal routine. When I came back to my bed i noticed quite a lot of blood near the side of where I lay my head. I then come to the conclusion that i might have sneezed in my sleep. So my question is, is it possible and what does it mean to sneeze blood in your sleep?

Symptoms: Sneezing

Doctor: