Are Occasional Snoring And Breathing Issues From That In A Child Normal?

my son 9 year old .he is having snoring issues during night time especially second part of night time after 2 pm. looks like slight disturbance during sleep but he wont wake up. other wise perfectly normal once he got up from the bed and during day time with respect to food activity and behavior .only during sleep he is snoring /noisy breathing . is it ok or any medicine needed. once in a while he is having these problems during the year after having cold or without having cold.