Why so tired baby boy!

This poor boy fell asleep in about 2 seconds while I was giving Lily her bite at lunch. The past 2 days have been horrible as far as sleep goes. I am hoping it's a growth spurt, milestone or whatever. My sister in law told me that when babies are about to hit a milestone they will start eating or sleeping differently.
Let's start with Wednesday. We had a playgroup so the babies didn't go down at their usual 10 am time. I fed them lunch around 11:30 since they were both fading fast. After lunch they went to bed and napped for TWO HOURS!! They were fine the rest of the day and I thought for sure bed time would be normal since it was 5 hours in between sleeps. NOT!!! So we put them down at their regular 7 pm time. They cried and giggled and blabbed until 7:45. I stayed up until midnight working on Christmas cards, Aaron played guitar. Why oh why don't I go to bed earlier? Around 5 am Preston started crying, not a whimper, an all out cry fest. I rushed in before he woke the almighty princess Lily. After a bottle, orajel, teething tabs I thought for sure he would go back to sleep. No way Jose it was party time. I put him in bed with us which we never do and now I know why. He jumped around, laughed, patted daddy's head. Around 6 am I put him back in bed and he went out like a light.
Thursday was a normal morning. The babies did not want to go down at 10 so I held off and fed them lunch then put them to bed. Once again long nap only an hour and a half. Bedtime, same thing did not want to go to bed. It was Lily's turn this time, she woke up at 4 am and I did the same exact thing I did for Preston the night before. She fell back asleep around 5 am. First I would like to say I don't know why I thought putting them in bed with us would work. They partied like it was 1999 and I can't help but laugh when Lily is lunging towards Aaron and laughing then looking at me wondering why he doesn't respond, it's called sleep sweetheart.
So today I made sure we stuck to our schedule of 2 naps. They did wake up a little earlier than normal so that was a great start. When I put them down at 10 I put Preston in the pack and play in the guest room and Lily in her crib. They slept so much better. We were on the road at 2 but they slept for about 45 mins. Let me just tell you they were begging me to let them go to bed tonight at 7. Hopefully they will not wake up. If they do it will be ok though because.....

I will miss these days once they are gone.