Dry mouth at night can be caused by several conditions or situations. You may experience it occasionally due to infections, viruses, or not drinking enough fluids throughout the day. However, it’s important to pay attention to when it happens so that you can figure out what causes extremely dry mouth while sleeping.
Dehydration is a common cause of dry mouth at night, and it can be triggered by illness, excessive sweating, and blood loss, among other things.
Certain medications cause dry mouth.
Some autoimmune conditions, like Sjogren's Syndrome impact the body’s ability to make bodily fluids, like tears and saliva.
Nerve damage to the tissues of the head and neck due to injury or surgery can impact the salivary glands and cause dry mouth.
Lifestyle choices, like smoking, contribute to dry mouth at night.
Mouth breathing instead of nose breathing increases air flow through your mouth and can dry you out.
Infections and allergies can trigger dry mouth
Sleep Apnea is a common cause of dry mouth overnight.