hello and thank you for asking HCM, I understand your concern. Blood cloths in your nose can be result of sinus infection, trauma, low humidity, or a reaction to medication. Low humidity is another common reason. In very dry conditions, the mucous membranes inside the nose start to dry out and become fragile. The patient might develop a small bleed that clots, and later throws the clot when she blows her nose. Patients can control for low humidity by applying moisturizer to the inside of the nose. A simple moisturizing jelly is often enough to take care of the problem. Nose picking can also lead to blood clots in the nose. If a patient picks the nose aggressively, he can cut the inside. The cuts will clot over and they may appear when he picks his nose again. This can create a cycle of bleeding and clotting, as the patient will keep exposing the cut. This will cause the nose to bleed more and may trigger more nose picking, as the patient will want to clear the itchy scabs and clots. My suggestion is to check the humidity of the room you are sleeping in. If this is ok than visit your GP or an ear, nose & throat doctor to check your nose and sinuses. Maybe you have an unrecognised inflammation or some changes in your nose which lead to this . I hope this answer was helpful to you.