I've posted on a few other toddler sleep posts before but I thought I'd start my own in the hopes of advice from the wise @FATEdestiny or, quite frankly, anyone with helpful words! Sorry this is long but I wanted to list it all out for people to review and give me pointers!
Our 23 month DS has always slept quite well. Strict bedtime routine, finish with stories, then quick cuddle and into his cot, say goodnight and leave approx 7.15. He has been excellent at drifting off himself and only occasionally needing us to go back in for an extra cuddle. He is an early riser 5.30-6.30 but we've never minded as (unless ill) usually sleeps through.
He is still in his cot with bars up as has never tried to climb out, rolls around a lot and enjoys a sleeping bag as not quite ready for a duvet.
He still naps in the day and has NEVER refused a nap, always seems ready for it and reenergised afterwards. Sleeps around 12/12.30 for about 1.5 hours.
So the above was going great, until about 2.5 weeks ago when he suddenly started waking in the night extremely upset and wanting cuddles. This progressed and got so bad that he wouldn't want to be put down in the cot and got very upset when we left the room. It escalated so that we'd stay until he was asleep but as soon as he noticed we'd gone, he'd scream and the cycle would repeat. We were up for 3/4 hours with this.
We decided this couldn't continue so did some reading about 2 year sleep regression and decided to stop 'babying' him when we went in during the night. So now we wait 3 mins to see if he'll settle himself then go in, get down to his level next to the cot, quick cuddle without picking him up, explain it's bedtime, ask which teddy he wants to cuddle, encourage him to lie down himself, tell him we're just next door, we love him, quick stroke of the forehead and leave. This has been better than simply going in, picking up and putting down as he'd get hysterical when we left whereas this way he's nice and calm.
However, he will stay lying down and probably trying to go back to sleep (maybe even actually going back to sleep?) for 20 ish mins before he stands up and cries again. We leave him progressively longer each time by 1 min but this cycle continues for usually 2 hours on the nose before he'll lie down without us going in and go back to sleep.
We both work full time and although taking it in shifts, you can't really sleep through it so are exhausted. I'm heavily pregnant and neither of us are keen on co sleeping as both light sleepers and simply wouldn't sleep with him in bed.
He has a dummy but we ditched the white noise some time ago. We wondered if he is scared of the dark so he has a nightlight which means his room is slightly lite. We've tried the gro clock but he doesn't quite get it (or care!)
Is there anything else we could be doing or anything we should do differently? We're keen to get our good sleeper back before we have number two. Is this just a phase and we simply have to ride it out? It feels like he's formed a habit now and can't seems to get out of it!
I'm willing to take any and all advice given!