Hi again Laura. Sorry to hear that you're still having trouble with DS, even after the sleep clinic. So I'm assuming that they said the lengthy NWs are behavioural? My DS still does it too and he is now 26 months!! I have had 4 hour NWs with him in the past, but v rare. I think they have only happened a few times and the last one was a few months ago. Mostly his NWs are 60-90 mins but he is getting better. Some weeks he doesn't do it at all and then other times he does it once or twice a week, but this is heaps better as he used to do it 3-4 times a week! I went to a paediatrician about it and she couldn't give me an answer as to why he does it and also said he is growing and developing fine so it isn't a problem, and he isn't autistic. My DD used to do it too, but I think she only ever did 4 hour NWs twice. She will still sometimes be awake for up to 60mins in the night and she has just turned 4 and I'm sure it's b/c she won't always have a nap and really needs to most days so she gets OT. But again this is better than she used to be as she used to be awake regularly at 18 mths for about 2 hrs. Then she suddenly started sleeping 2hr naps and 10hrs in the night regularly when she was 22 mths. But DS, I just CAN'T get him on a routine. I think his problem is mostly OT, but sometimes is teething or dreams. He overtires v easily and will invariably have a short nap b/c of this. Even if he has a long nap when he is a bit OT he will wake grumpy and then not always sleep well that night. It's as though his nap has to be exactly right or you've had it, and it's really difficult to get it right with him.
I have read that food intolerances can cause insomnia as they can produce histamine which can hinder sleep, so I might have another go at cutting out some foods again and see what happens. But apart from that, I have exhausted every other avenue. My LOs do not cry the whole time they are awake, they are not in discomfort and it is definitely not behavioural. I have rung various sleep clinics and they have either said they are playing and we should go in to them to tell them to sleep, but they still don't sleep, or they are still learning to STTN, or they are overstimulated. So I don't think anyone really knows. There is obviously a big market here for a new type of sleep book, so when we get the answer we can write one and be rich!!!! But seriously, wouldn't it be lovely if they were only awake for a few mins in the night, nevermind STTN!!