Hi, my 4 years old son has a problem of sweating when sleeping. it has been happening for a couple of years now. should i be worried?

Snoring?: If he has large tonsils and adenoids, one possible cause is sleep disrupted breathing. This may result in sweating and sleepiness during the daytime. Other causes include asthma, cardiac conditions. A sleep evaluation is indicated, please speak with your pediatrician. Keep nasal passages clean and use nasal saline spray. He may sleep with two pillows to keep the head of the bed elevated.