My 19 month old (even with being on schedule) is going through sleep regression. He already takes one nap and sleeps throughout the night. But lately he's been taking later naps but usually it doesn't interfere with his sleep at night. But he has been sleeping late for the past 3 days and today he didn't take a nap (refused as much as I tried,tried many activities/walking). So he went to be early and I can hear that he's snoring which I have never hear before. Could this be because he's tired ?