He has a small crate inside a larger pen, down in the kitchen. I slept on the floor next to the pen for a few nights, and he thought that was great, but had to stop as I'm not in great shape physically and it caused a few issues with my health.
Instead I started sneaking off to bed as soon as he was asleep and coming down every couple of hours to let him out to toilet, then settled him back down, wait til asleep again, then back to bed myself. A few times I miscalculated and he's already done it, sometimes I got it just right.
I'm still getting up with him every 2.5 - 3 hours, but he's a lot more settled and less clingy now. He doesn't make a noise unless he needs the toilet and I'm not there, so I think it's just a sign of his general maturing and confidence developing. At first he was like a limpet, wouldn't let me out of his sight, but now he is quite relaxed if I leave him in the (secure) garden and go back indoors for a few minutes - in fact he barely notices I'm not there!
We've also cracked a couple of other issues - potty training is complete, he's now clean and dry day and night, and he is also walking a lot better - at first he would just refuse to walk, sit or lie down and I would not get anywhere with him, but I started walking with a neighbour and her dog, and that helped a lot. He still doesn't like going out in the rain though, but he will force himself if he needs to toilet!
I suppose, at the end of the day, you realise it's not the dog that's been trained, it's you!