Good to see you back.This is probably just a comforting habit that your son has developed when he is falling asleep, much like many children who suck their thumbs instead. The question is whether he also has a blocked nose or if his tongue is interfering with his breathing. If his nose is blocked he may need an examination to find out if he has enlarged adenoids or some other reason for this problem. It may also be time for him to be seen by a speech therapist who will assess any problems with his tongue and recommend treatment measures if required.
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