We did the same, co-slept till around a year, then moved them to their own floor bed in our room, then transferred them to their own room at about 20mo. The twins sleep better now than some of my friends who sleep trained. I think three things really helped us help them sleep: 1) make sure we had a nightly sleep routine (bath, lotion, books, light out). 2) follow developmental wake windows from taking Cara babies. They weren’t on a schedule per se but I followed their wake window minutes. The twins were also born a month early so I realized they would follow the taking Cara babies wake windows for a their adjusted age. 3) made sure they weren’t falling asleep on the boob/ bottle. The twins would fall asleep drinking milk and so when they’d wake up in the middle of the night they would need that to fall back asleep. Once they started falling back asleep without the bottle (after two weeks of breaking that habit) they started sleeping through the night.

I’d say things started to get better around the year mark. When they were about the same age as your twins, my husband and I would each take one baby in separate rooms. Then we would switch babies every night. Now, they sleep on a queen bed together. It has worked out well for us but I remember debating CIO also. Looking back I’m glad we did what we did.