Suddenly considering CIO at 15 months. Has anyone done this at this age?

Hi everyone,

I’m honestly at a bit of a breaking point and looking for advice or experiences from anyone who’s been here.

My 15 month old has suddenly started struggling a lot with sleep. This was previously not an issue for us. Now bedtime and naps have become really hard.

He will go down but then wake after about an hour, sometimes from the smallest noise like a door creak even though he has a sound machine and his room is separate. Once he wakes, he struggles to settle again without one of us going in.

At bedtime it can take a long time to get him settled and he gets very upset when we try to leave the room. My husband is especially finding it really hard and we’re both exhausted.

I’ve already tried adjusting wake windows and we’ve also attempted moving to one nap. Nothing has really improved things.

We are now wondering if we should try full cry it out. I never thought we would get to this point, but we feel like we are out of ideas and need something consistent.

Has anyone done CIO at 15 months? How did you approach it at this age, and did it help? Did it get worse before it got better? Any advice or reassurance would be really appreciated.