What can cause me to get dry mouth, and wake up with my tongue stuck to roof of my mouth?

Mouth breathing: While sleeping the salivary glands shut down causing dry mouth. Breathing through your mouth can cause an even dryer mouth. If you are conjested, then mouth breathing will increase.

Medications & more: Many medications can lead to dry mouths. These include diuretics, antihistamines, heart meds, and others. Also mouth breathing & snoring can cause dry mouth syndrome. Dehydration, smoking , and alcohol consumption can also be causative factors . Remedies can include artificial saliva products, rehydration, and sleep apnea appliances. Please consult your local dentist and take care...