We ferbered about 6 months ago
I suspected so. This is a very typical response from a Ferbered baby. Im actually not a fan in most circumstances, because while it gives very quick results (in terms of going to sleep) it doesn't actually teach baby anything. So you just push the problems elsewhere.
You baby hasn't learnt how to go to sleep in a healthy way. He has learnt to zone out when he is completely exhausted.
Think about yourself in terms of healthy sleep - going to sleep when utterly exhausted is not the normal way to go to sleep. We should go to sleep as we get tired. But the time between just starting to get tired until you might describe yourself as "very tired" is about 2 hours or so. The time through to total exhaustion cannot stay awake any longer, in an adult, might be 4 hours from when you first got tired.
In a child/toddler, the time from DC being at the Just Got Tired point until the Very Tired point is about an hour. The "tells" for being Very Tired are outward signs like eye rubbing, yawning, clingy, whining. The point from Just Got Tired right through to Completely Exhausted is 2 hours or so. The "tells" for being Completely Exhausted increase from crying to constant crying unless being help, to grumpy and not happy with anything, to screaming and thrashing around.
The right time to go to sleep is when he has Just Got Tired. This is before there are any outward signs. Some parents get used to knowing when this will be so pre-empt and go for a nap when you know he's due. But if you're not used to knowing this yet, then use ^any negative sign". This could be a single cry, an insistence to be picked up, being unwilling to play - these are all precursers for whinging, clinginess and grumpiness, but before they start.
You're issues here is that your baby has not learnt to self settle when Just Got Tired. So you need to help him.
All those things I mentioned above will help (movement, sucking, physical contact). But the fact is, just assuming he doesn't want/need to sleep because he wont go to sleep - that's untrue and the roor cause of the problem here.
He needs to go to sleep, but can't and needs your help.
All that about he won't go to sleep is he's had a morning nap - that's not him not needing to sleep. That's him not knowing how to go to sleep and needing your help.
When he wakes up grumpy. Get up, give him breakfast and milk (or whatever). If he is immediately still grumpy, then do nap time - he's tired. Don't focus on "he didn't have enough sleep at night" - because he did, he had 10 hours. Instead focus on quality daytime naps.
For now, doesn't matter if he's back having a nap at 6am after breakfast. He's chronically and long term sleep deprived and some emergency short term measures are needed to get him out of that.
For 3 weeks, focus on ANY SLEEP, ANY HOW.
- Use the pushchair for naps. Keep it moving all of the time in order to keep him asleep for as long as possible,.
- Do a morning and an afternoon nap. Yes the afternoon nap will be hard work. Getting children who dont sleep well to sleep is always hard work - so set your expectations that it will be hard work. Have lots of patience with him, and keep going. He needs the sleep, he just doesn't know how to do it.
You will almost certainly end up with difficulties going to bed at bedtime as a result of this. Because baby will now be healthy levels of tired rather than Completely Exhausted which is what Ferber sleepers need. So have a plan for how you'll give him extra help to get to sleep at night.