My just turned 5yo DS is still in nappies at night.
During the day he is fine, generally. We potty trained him at 2.5, it was too early but nursery told us he was ready so we went for it. It was a slog but he was reliably trained at just gone 3.
He's never been dry at night. Never ever had a dry nappy in the morning. I understand that a hormone is responsible for supressing urine at night and assume this hasn't kicked in for him yet.
The other night I went upstairs half an hour after putting him to bed. He was still awake but his nappy was wet 
. I had words with him and told him that wasn't really OK and if he was awake he definitely needed to use the toilet.
In the morning he's never in a rush to take his nappy off. He will if asked but sometimes he will sneak downstairs in the morning to watch TV and won't take it off. I suspect he may have the odd sneaky wee in when he's awake first thing.
Given its the holidays, this week we went without nappies. He was happy to do so. We stopped all drinks 2 hours before bed etc. But he's literally wet by 10pm and we have done several changes of bedding a night. So we have stopped and gone back to the nappies. He's obviously not ready. He also doesn't wake up when he's wet, its us noticing and waking him to
change the bed, not him.
How usual is all of this?
I am surprised he isn't bothered by a big damp, smelly nappy when he wakes up. If your DC is a similar age and in nappies at night, what do they do in the morning? Is it really unusual for him to not be that bothered by needing/wearing a nappy still?
I have some queries as to wether he may have some sensory issues, so half wondering if this is bundled in with that. But I'm just not sure if this is actually fairly typical or not.