Dealing with sleep regressing 17 month old sharing room with 3yo sister

[PaulHollywoodsSexGut]

For those of you who are advocates of CIO (cry it out) or the PUPD (pick up put down) methods how do you implement these with another kid in the room?

DD is 3 and can sleep through a fire alarm/massive storm/exploding microwave (all have happened). She and DS share a room and have done since he was 6 months old. Both are (usually) decent sleepers.

However DS is hard in a sleep regression phase and we need act before we get actually ill with the repeated night wakings (2200, 0100, 0330, 0545). I have absolute conviction that CIO will break the habit he (and we) have got into of giving him bottles and holding him until he sleeps but how did those of you who’ve been through similar cope with trying CIO when the younger one shares a room with an older, decent, sleeper

FYI we live in a tiny cottage and there is legit nowhere else we can put either child to sleep; they HAVE to share a room. We are moving in 7 weeks though and if things are still mental will split them up but would rather not. Again thoughts welcome.

Surely the upheavall of the move in 7 weeks will undo all the work you do now?
If Dd can sleep through an alarm she won't even notice if you do CIO with the younger one.
I'd go with the super nanny way of doing things tell him whats going to happen when he goes to bed 17months is old enough to do as he's told, no speaking, no bottle, keep it dark (night light maybe) lie him down, tuck him in, work your way back to the door each time you lie him down. I'm sure you can find it online somewhere it seems very effective. I'll have a google and see.
I did something similar with Dd at 8 months, she would laugh when I walked into the room, so I knew she knew what she was up too, clever little monkey.

I think this is the one I was thinking of.

Thanks @Troels that is the exact method I’m speaking about that we intend to start basically tonight.

I should have made clearer though that at 2200 and 0330 DD is in a lighter sleep phase and we have had her wake up last two nights and fail to settle for ages when we have tried to stick to letting him cry for 5-10 mins before we go in.

To let him literally CIO is likely to be enough of a sustained noise assault that will eventually wake her. And DD is awful with broken sleep, she can go 7-7 no probs but of late she’s had a cold and has been dead on her feet by 5:30 and won’t nap in the day.

Can you put her on a little makeshift bed on the floor of your room for a few nights while you sort out his night times?

Nope, else I’d fall over and break my neck.

What did you do when your toddler regressed and room shared?

Anyone???????

My oldest was a bit older than yours and he'd tell the little one to be quiet. Then just go back to sleep. It seemed to work. He only tried it for a week or so, and wasn't getting anything out of it, so gave up.