Is there a trick to it???

So at 9 months and 3weeks old Wylie is sleeping through the night. Not the pediatrician version of five hour stretch but actually sleeping through the night! He goes to sleep at 8:30pm and doesn't wake up until 5-5:45am! This started the night I got back from Vegas and continues. He did this for the babysitter last night, and I was positive he wouldn't. Bonus: In the morning we still get to snuggle.