Night Time Wakings

I understand what you are going through. I have a hyper dd who just turned 2 about a week ago. This is a normal thing going on and yes his sleep schedule is changing as well as those 2 year molars are working on coming through. The doctors told me that they could also be night terrors. The only thing that was recommended was to give some motrin or tylenol and see what goes from there. If they sleep through the night they said it could be the teething if it isn't than the night terrors and sleep schedule is shifting. I hope this helps and gl.

When my daughter started nearly the official two-year old mark, her sleep patterns changed. She started napping only once during the day and the length of that nap would vary. If the nap was short, she went to bed just fine. If it was over an hour long, then she fought us at bedtime and would lay awake playing for hours.

Now, she's almost four and we have to keep her nap down to less than 45 minutes. We also have to make sure she gets a lot of activity and has time to play and run around. The more active they are during the day, the better they sleep at night.

I know that's easier said than done with a new baby, but it will help. You may try limiting his nap times and seeing if that helps.

The good thing about this sight is you will get a lot of ideas, and here is mine, since routine isn't the problem it might be that he is getting to much sleep, and that is interferring with his nighttime sleep, I know that is something most mom's don't want to hear, especiallif it means giving up thst break during the day, and I say this cause he isn't waking up for just a bottle or night time snuggle and then going right back to sleep, he is up and ready to go, I have 7 and have had some that can keep their naps and others where I had to take it away, the question you have to ask yourself is this, would you rather deal with a cranky little guy for a few hours in the evening, at least until he gets used to the new schedule, continue your night "parties" or, and here is one I don't like, let him CIO.

I would try it for a week and see if his night sleep gets any better, just know that the evenings will be a little hard so you need to be prepeared to do a little entertaining until he gets used to it, just my thoughts good luck!

You said your little one is healthy, but did you bring up the sleep schedule issues with the doctor when you were there? Sometimes we overly tired moms miss bringing those things up with the doctor.
My only advice is to keep to a very tight routine for an entire month and see if that starts to help. At 2 years old he won't need 16 hours of sleep a day. My son only needed about 12 hours a day at 2 years old: a 2.5-3 hour nap and 8-8.5 at night. Gratefully (since I really need the nap time for me time), he still needs that when we keep him active and playing outside in the morning.
Be careful about what kinds of habits you set for getting your child back to sleep at night. If he comes to depend on you, you'll never get any sleep. For more suggestions, I recommend "The No Cry Sleep Solution". From what I remember the author goes into the science of sleep and how much kids need at what ages.
Good luck!