Hey Alla,
That is SO AWESOME that she slept better and so long! And a bit later morning WU than the day before, right? Yay.
So, on that magical day where I put him in bed at the 9:35A mark and he slept 11.5 hours, the following night was a mess. The day after the long night was 11A (or maybe it was more, I'm not sure) and it was far too much, plus a crying fit may have added to the adrenaline/cortisol and made him even more OT.
Since her nap was still OT, it might be worth a try to put her to bed at 5pm again. Or maybe just a hair later... 5:15? I would guess 5:30 at the latest, though that might even be too late, that would be going to bed at 10:40 A, and if it takes her 30m to settle, it might be too much. At least, it has been for mine in a similar situation.
If it works, it may indeed mean she only sleeps 11 hrs, and wakes up before 5.. yikes. But it would be a better-rested 11 hrs, and then maybe you can work her later over the course of a few days, once she's got the OT out.
Yes, that idea about facilitating a crash on purpose would mean sticking close to set nap and BT which would likely mean far too much A, in hopes she would crash. Like I said, I've never tried it on purpose, it just happens sometimes when he's OT. I'm not sure how to determine how much would make a crash, and how much would be utter catastrophe, creating an 8 hour night or something. It's probably a last resort sort of thing.. at least for me... but I suppose that's what a lot of people do: stick to the schedule and wait for the LO to fall into it. But I think some LOs take longer to fall into it that way than others, I think mine is one that doesn't recover or make up sleep as well, so not my first choice for him.
My DS tends to like 13 hours in a day, I think. But when extremely OT, he'll do 11:30+ hr nights, given the chance. So the 9.5 A BT has worked after a 10hr night (preceded by weeks and weeks of nightly OT), and 10 A BT has worked after a 10.5 nt. Not every time, unfortunately, but frequently.
If the nap is short.. say 1.5 or less, or a broken/who-knows-how-long-he-actually-slept, or if he wakes up screaming... I've done 10:35A BT (he fell asleep at 10:55) and that night was 11:40 with some short WU. But I think that was a crash night, not as restorative as it would have been with a shorter A. I've also tried 9:45A in bed, and I think that was too late, too OT to settle already... so yeah: short/broken naps = 10A BT or less, I think.
I can finally attest that it does get better (knock on wood). *Just* this week, LO is defying my meticulous records and sleeping on in the morning despite an expected OT EW. He's 19mos.
Let me know how it goes tonight!!
Amanda