Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concern.
As per your complain and presentation of symptoms the most common cause of
drooling of saliva from mouth while sleeping is
Mouth Breathing Habit and a few other causes like
acid reflux, oral infections, respiratory problems etc.
Nothing to worry about it as the problem can be controlled.
If you have a mouth breathing habit a simple remedy can help.
You can stick a vertical strip of doctor's tape or micropore tape over your closed lips so that mouth will remain closed while sleeping,
nasal breathing will be enforced and drooling will not take place.
If you find any discomfort in breathing with mouth closed then there can b some respiratory issue and in that case you can
consult a PULMONOLOGIST.
Hope this information helps..
Thanks and regards..
Dr.Honey Nandwani Arora.