My Son Aged 17 yrs, ht 5 '11', weight 63 kg when wake up in the morning has problem of sneezing ( 5-6 times with 4-5 continous sneeze at once) with some cold from nose... After 1-2 hrs he gets completely well ( ie no any sneezing or cold)...During entire day no issues till next day morning when he wakes up...Earlier 10  months back we showed to ENT who has told that it is allergy.... He has given some nasal droplets and allegra M to be taken symptoms remains for the day.. We are not giving it as during day there is no issue. Can you please suggest any effective alternate treatment /medicine to cure this morning sneezing.