I have been bitting down on my teeth so hard while in deep sleep that i'm worried i will break a tooth and it wakes me up. i wake with headach?

Bruxism: Clenching or grinding needs to be treated with a professionaly made night guard

Bite plate: Your dentist can help you with this problem. Perhaps a bite plate will help

Biting hard: This is called bruxism, which is chronic grinding and/or clenching the teeth. It is a habit usually caused by stress or a bad bite. It usually occurs at night during sleep, but is also common during waking hours. See your dentist for an exam to diagnose the cause and a recommendation for the appropriate treatment. A bite splint can help prevent damage to your teeth, but will not stop the clenching

Night guard: Your Dentist that can fabricate a night guard for you that will stretch your muscles, reducing muscle stress, and it will protect your teeth.