Hi Ozgal,
I read your post at 3:30am this morning, while desperately trying to find a solution to my own potty-training DD (21 months) wakening in the middle of the night, for the third night running.
It sounds like your daughter is doing brilliantly with the potty-training, and no issue with her wakening up and calling for a wee at 5am, I bet that's just part of the evolution and will get later and later as the days pass - it's just for now the settling back down for some more sleep which is an issue.
It's so hard to get them to try again. I think that's the trick though - you have to lift her for a potty-trip, but she has to go back to bed and know that it's not time to get up yet. Sometimes it works when I make our DD cosy again, blanket, dummy, music on baby monitor like the bedtime routine. A few times I let her howl a bit and she settles within 5 mins. Other times nothing works.
We started potty-training 5 days ago - reluctantly, and with the advice not to go there before 2 years old ringing in my ears. DD was already using the potty at bath-time (I did this with all three of my children in the run-up to 2), asking for the toilet regularly throughout the day. Last Friday morning when she came to breakfast and said ' Mummy, wee-wee, toilet please', I decided to just go for it. She had just 2 accidents in 3 days, and already on day 3 she started to ask to go. So I do think she was ready - but - maybe it's harder pre-2 to emotionally handle it, and she's having a tough time with the night-times. She's not too happy putting a nappy on at bedtime, although settles okay after a couple of minutes. She seems to wake then around 12 with the need to wee, calls out for the toilet, would be distressed if I didn't take her, and empties a full bladder. But last night this keep going until 3am - by which time we were both exhausted, and I was making all the bad parenting decisions (taking her into our bed/putting her back in her cot, taking her to bathroom/telling her she doesn't really need to go as went 10 mins ago).
So my strategy for tonight is to put her in pants and PJs, ditch the nappy, so that she's more comfortable as this is her new status quo. Then, at our bedtime (11pm ish) I'll lift her for a bathroom visit. And if she calls out again between that and morning, I'll deal with it - even if she wets, can't be worse than the 3.5 hour saga of last night.
Mind you, all of this wonderful decision-making is on the back of just 3 hours sleep last night, so feel free to chip in with something more rational...