Hello and thank you for your question.
Based on your description it sounds like you bit your cheek in your sleep known as Morsicatio buccarum. The best thing to do is apply warm salt water to the area. Swish and spit 10oz of warm salt water 4-6 times a day to decrease the swelling. If the symptoms persist longer than five days, go into your dentist to be evaluated for other possible pathologies. Most are benign. It will return to normal within a weeks time unless you continually bite your cheek.

Best wishes and good health

Dr. Ward

hello and welcome,
do you had any insect/worm bite while sleeping?if you can see any punctum at the affected site,this may be result of such bites.
salivary swabs/lip/teeth marks can be used for further investigations.if it is poisonous and it entered into body,antivenom treatment can be done.
if this is only cheek biting,apply dologel/mucopain ointment on the affected site.take dolo-650,twice daily for 3 days and cap.spamox-500mg ,thrice daily for 3 days to relieve pain.
also check the occlusion of teeth.if there is any traumatic bite,get it corrected by orthodontic appliances.
regards
DR.BINDIYA

hello and welcome to HCM forum,
i am glad you posted your query,
i would like to inform you that if you that the tissue that is bulging on the inner side of your cheek is nothing but the soft tissue which was bit by you accidentally while sleeping , it will take approximately 3-5 days for the tissue to revert back to normal.
i would recommend you to visit your dentist if the check is hurting too much, a topical gel will provide relief.
use an antibacterial mouth wash(twice/day) for 1 week, to avoid chances of infection.
i hope i answered your query,
i wish you good health.

hi, it seems that you accidently bit your cheek while sleeping, it will heal spontaneously within a week. You can apply mucopain gel on the affected area twice a day for pain releif, avoid eating hot and spicy foods till it heals.
take care

Hello & welcome,
First relax as cheek biting while sleep is a common thing that can happen with anyone.
The only thing for which i am concerned is that as you have mentioned " a huge piece is hanging over".
This is because usually cheek biting while sleeping is not so extensive as to cut of large part of your cheek.
But if it is so, you should undergo oral examination for the same by dentist as it may require to get sutured to heal properly.
Wound in oral cavity heals faster than on any other part of body except those on face.
*So, here most important is get your wound examined by a dentist to rule out need for suturing.

Take care.

relax . since you haven't provided any history i presume it was overnight and thus probably due to cheek biting .if the area is tender ( pains ) apply mucopain or dentogel like topical anaesthetics. if the problem persists you may also apply kenacort gel but mucopain would suffice