Gum bleeding when sleeping, what is the matter?

There are many reasons for gingival bleeding, which can be divided into two major aspects. On the one hand, it is caused by local factors such as gingivitis, gingival tumor. On the other hand, it is the bleeding of gum from systemic disease, such as anemia, leukemia hemophilia and so on.
Eat more vegetables and get enough sleep
If you are short of Vc, eat more fruits with Vc, such as oranges, or eat vitamin C. If not, go see a doctor. Also, pay attention to cleaning your teeth!