Sleeping at night was bitten out of a horizontal mouth point bleeding, may be bitten by mosquitoes, may be bitten by fleas, may be bitten by ticks, and may be bitten by the cryptococcus. 1. Mosquito: mosquito bites the human body, due to local itching, people may be unconsciously scratching in their sleep to relieve, which can lead to the bite of the local appeared to be bitten out of a horizontal mouth point bleeding symptoms, can be cleaned up the local blood, and then in the local application of anemone, cool oil to alleviate the symptoms. 2. fleas: flea bites can also lead to patients to sleep at night was bitten out of a horizontal mouth point bleeding symptoms, patients in the bite of the localization can also appear pimples, blisters, can be applied locally glycerine lotion, for the itchy symptoms of patients can also take loratadine and other drugs for treatment. 3. ticks: ticks bite the human body can also appear at night after being bitten out of a horizontal mouth point bleeding symptoms, local itching, redness and swelling, can be bitten on the local disinfection, and oral cetirizine and other drugs, and then should also be observed to see whether the patient has a fever, skin erythema and other symptoms. 4. Cryptococcus: cryptococcus bites the human body can also appear at night after being bitten to sleep out of a horizontal mouth point bleeding symptoms, you can use budesonide cream, mupirocin ointment and other drugs for treatment, but also oral imipramine and other drugs to reduce the symptoms of allergy. In addition to the above mosquitoes, other insect bites may also cause patients to sleep at night bitten with a horizontal mouth bleeding symptoms, it is recommended to consult a doctor in time to find out the cause of the problem, please ask the doctor to deal with, avoid self-medication.