Oh we had an awful night too, wouldn't go to sleep till about 4 hours after his usual bedtime and then woke at 3am and I had to sit there for like 45 minutes even though I was about to burst my bladder.
I had the same thought, is this too soon? But then I also thought, now that they know the cot isn't a magical prison they might be more likely to climb out.
Also won't we just have to go through this all again????
I don't know, I think we are all doing incredibly well. Maybe just a little more perserverance?
PS DS didn't have his day sleep yesterday either.... argh