Increased red blood in the eyes after waking up, usually due to the following reasons: First, is due to allergic conjunctivitis, usually due to bedding, such as pillowcases, pillows, sheets in the cotton wool, skin debris, mites, etc., caused by eye allergies, in addition to increased red blood, but also cause itching, sticky discharge and other symptoms of the eyes; second, is due to conjunctivitis, usually because The bedding has not been changed and contaminated for a long time, the eye contact with the bedding when sleeping and caused by infection, in the eyes with red blood, but also a large amount of eye discharge and other symptoms; third, is caused by exposure keratitis, some patients may occasionally have poor eyelid closure when sleeping, so that part of the cornea and conjunctival tissue exposed to the air and dry, causing damage will lead to irritation of eye congestion.