One Nap Transition...

I am currently just started if to transition my little to one nap. I think she is ready because she keeps just playing in her crib during her second one. Yesterday was the first day I did it by choice and she kept waking up in the middle of the night and she has slept through since she was 5:5 months. Not that she never wakes up in the night but it’s not very common and last night happen 5x. My other thought was we went to a very busy indoor gym yesterday and that it could be overstimulation. Any one else experience this moving to one nap??