Aiyah, resdung in kids can be tricky lah, a few of us mums faced this, and sometimes it's the adenoids or tonsils causing the snoring and blocked nose thing. My friend's boy had the same snoring and morning sneezing, and it turned out his adenoids were quite enlarged; the ENT did check and gave them options, so I think worth getting it looked at by a doctor to see if it's resdung, adenoids, or tonsils lah. In the meantime, try humidifier at night and make sure his pillow is higher, sometimes helps a bit with the congestion. Let me know what the doctor says, because parents dealing with this would love to hear how it goes for your son!