If there is a large amount of nosebleeds in the middle of the night, consider the following reasons: 1. It is likely that the patient’s nasal cavity is very dry when he sleeps, and he unknowingly digs his nostrils with his own hands, which can easily lead to the rupture of the nasal mucosa, and a lot of blood will come out, and the patient may be very afraid. 2. It is likely that the patient has high blood pressure, and the range of blood pressure fluctuations is more obvious at night, which can easily lead to the rupture of the blood vessels inside the nasal cavity and the appearance of 3, the patient is likely to have a blood system disease, if the coagulation function changes abnormally, it will also lead to a lot of nosebleeds in the middle of the night. No matter which of the above reasons is the cause, it is best to deal with it actively. If the nosebleeds are not under control, you can take the time to go to the hospital to avoid shock due to excessive blood loss.