Other factors:

He notes that pregnancy-related acidity is a possible cause.
Treatment for drooling in the morning:

Identifying the specific health problem causing drooling is crucial to getting effective treatment. Consulting a doctor in cases of allergies, poisoning, sinus infections, dental problems, nerve infections and other possible causes is the first step. Additional strategies include:

Sleeping on your back:

Changing your sleeping position to lying on your back can redirect saliva to the back of the throat, preventing excessive drooling.
Head support:

Supporting the head while sleeping in an upright position can help prevent drool from drooling during sleep.
Consult a doctor regarding medications:

Discuss medication side effects with your doctor and explore alternative options if necessary.
Breathing through the nose:

Encouraging nasal breathing can reduce the likelihood of mouth breathing during sleep.
Deep breathing exercises:

Incorporating deep breathing exercises into your daily routine can improve breathing patterns and manage stress.
Allergy management:

Treating allergies in ways that do not affect nasal breathing.
patience:

Realizing that treating drooling may take time, incorporating relaxation techniques, such as warm drinks, can help with the process.
Additional recommendations from the Mayo Clinic include facial exercises and facial massage with lavender oil to relax muscles and reduce sagging during sleep, which contributes to less drooling.