causes of biting tongue
Teeth grinding or bruxism. Sleeping bruxism is another cause of tongue biting when in sleep. In most cases, it is accompanied by other sleeping disorders such as sleep apnea which causes breathing pauses. Snoring is also a common problem that comes with teeth grinding.
1 This can cause you to bite your tongue in your sleep.  Rhythmic movement disorder â Disorders that cause the body to twitch or move suddenly during sleep may cause you to bite your tongue. Some may actually injure their tongue with these sudden and spastic movements and wake up to blood on their pillow.
If you want to know the causes behind tongue biting in sleep, most of them are actually pretty common among most people. It may only happen once in a while or on a nightly basis. Here are some of the more common causes: Seizures at night.