M.N.
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.