Transition from sleeping bags to Duvet and Pillow

[Elephantonascooter]

DS is 19 months and very stubborn! He has slept in grobags for his whole life and lives them (gets the bag and his toy and gets in it himself in the evening) however he is waking up at 4.30 everyday and just screams in his cot. When we get him out he wants out of the sleep bag and is often still tired but once he's seen us, that's it, he's up.
In my desperate, tired state, I have bought a toddler duvet and pillow set. I'm wondering how people have Done the transition.
Silly Dh has taught DS the 'sleepy awake game' in our bed where he pretends to sleep on a pillow then pretends it's morning a few seconds later. I put DS in his cot for naptime with the pillow and he just played this game. However, DS has always cuddled up to me for naps so this might be the reason too.
I'm reluctant to take the side off the cot bed as I think he's just a bit young but he can reliably cover himself in the duvet if he's cold/kick it off if he's warm and I'm hoping the lack of restrictions might mean he sleeps longer in the morning. Who knows.
Please help me with ideas and story's of how to do this!

I’m planning on doing it gradually so I’ve just in the last few days given DD (18 months) a pillow but she’s still in her bag at the mo. She’s adapted fine to the pillow and has been sleeping well so I’ll wait a bit then swap the bag for a duvet. She’s very attached to her bag so I think moving to a duvet will cause more of a issue than the introduction of a pillow so I’m not in any rush! Might leave her as she is until it starts getting cooler Sept/Oct.

Don't overthink it! Just take the bag away for the duvet.

Child might kick off for a day or three, then they'll get used to it. Done.

Whether it'll help with the early waking or not is anyone's guess!

We swapped when it was warm enough to not need either so it didn't matter if they didn't sleep under the duvet (they still don't very often). Didn't do it until we started using beds rather than the cots so straight into single bed with pillow and duvet.

We literally just put in bed with a pillow and duvet. No fuss, she probably didn't realise the differece.

A few things weve had to do:
Put the duvet sideways across her. She travelled up thr cot ending up out of the covers and got cold. Sideways stopped that.
Going in when I get up for the loo in the night to recover her. She often kicks the covers off when shes hot but cools down by morning. If I dont then she gets up between 5-6am usually.

We did this when our DS was 2 1/2 - he is tiny so could still fit into sleeping bags.

We started with just the pillow which he took to quite quickly.

For the duvet, we brought it downstairs during the day and had quiet time watching movies sat under it. Did that for a few weeks so he associated it with being cosy.

Eventually we put it at the end of his bed, kept the sleeping bag out but not in his bed and gave him a choice. At first he wanted to read stories whilst snuggled under the duvet but then would ask for his sleeping bag. After a while he started forgetting about the sleeping bag and kept the duvet over him.

Pretty sure that duvets aren't classified as safe for the under twos.

We use this: www.jojomamanbebe.co.uk/sleep-snugglers-2-5-tog-b7186.html

Thanks everyone. Some different ideas here so at least if one doesn't work then another might. Just going to go for it to start with and see what happens. If it does work then I'll try the gradual approach.
@FourPlasticRings thanks but I'm confident a 4 tog duvet is suitable for our son at 19 months.

My DS is 22 months and we've just changed him over to a duvet and pillow as he was getting too long for the sleeping bags, plus we'll need them for DD soon.

He used to travel all over his cot during the night, so we gave him the pillow first in an attempt to "anchor" him. Once he was used to the pillow and stayed in the right place all night, we introduced the duvet. I think he had it just for naps at first so I could keep an eye on him on the monitor.

We snuggled under the duvet on the sofa a couple of times so that he understood it was warm and cosy. Then we waited for the warmer nights so that he wouldn't get too cold if he kicked it off.

He now loves his covers and wants to be tucked in even if his room is 26 degrees We'll put him to bed with covers up to his knees or waist and he'll pull them all the way up as he settles to sleep. With it being so warm right now we have to uncover him and then tuck him back in on our way to bed! We check on him whenever either of us is up in the night - he's been a sobbing sweaty mess a couple of times when he's got too warm.

The temp is a worry of mine. I've just put DS to bed and so far, so good. Watching closely on the monitor at the mo. Will check on him before I go to bed. I'm thinking he will kick the covers off if he's too warm? Gosh this is a minefield!

when we first swapped our dd out of sleep bags we used a pillow and blanket for a little while and then put the duvet on after a few weeks. Shes fine with it and if shes ever uncovered when we come up to bed I know it's because shes too warm so she uncovers herself. apart from that she stays under the covers every time