Almost 99.9% of the time they never wake at the beginning of the night, its always the early hours if that helps any.
Cn changed around a month ago now, df said yesterday Leo was resisting a little with the first nap. When I put them down for the CN they weren't as bad as what they were the day before but still were not happy about it.
When we made a big change to the 10:25 sleep I'm pretty sure it was almost an Hr in change but I could be wrong, I would need to read through the old thread.