My toddler has unfortunately inherited my bad allergies - this means that at night when the two of us are in bed, lots of phlegm will build up in the back of his throat, causing him to cough himself awake. And while I can't say what he feels exactly, the way he rubs his nose repeatedly and makes uncomfortable noises with his tongue, along with a lack of any high temperature that would indicate a fever, very strongly indicates to me irritated allergies.
I would like to help him - preferably with preventative measures if possible.
I know that full allergy medicine is not advisable for children, but since he is almost 2 years old (11 days away~!) we have been giving him 5 ml of children's benadryl a night to help - and last night when he woke up from the discomfort my wife and I gave him some children's nasal drops, which seemed to help. I'm not sure if installing the humidifier would help, but I am willing to try.