Blood seeping from the gums before going to bed at night may be caused by long-term inflammation of the gums, blood clotting disorders, or long-term use of certain medications. 1. Gum inflammation. Gingivitis or chronic periodontitis, the gums are red, swollen and easy to bleed, after brushing at night, due to the stimulation of toothbrush bristles may cause bleeding gums. 2. Blood clotting dysfunction. Leukemia or hemophilia and other blood system diseases have poor coagulation function, and the gums bleed easily. 3. Long-term medication. Heart disease or cerebrovascular disease need to take long-term anticoagulant drugs, such as aspirin, warfarin, etc., under the action of drugs, gums are also easy to bleed, bleeding aggravated by external local stimuli. Gums seeping blood before going to bed, it is recommended to go to the hospital in time to check the cause of the disease, timely treatment.