Just wanted to post my experience here as someone who remembers their CIO. I know there's lots of debate about CIO and long-term effects. Not here to debate, just to post my own experience. A bit of backstory, I was adopted just before I was 2 to a single mother. I had pretty severe abandonment issues and could not fall asleep without her. She would usually stay in my room until I was asleep and then leave. However, every single night I would go down from my room and into her bed. Fast forward to when I was about 5 years old my mom met someone and eventually we moved in with him and his children. He didn't want me sleeping in their bed every night so eventually it got bad enough I was locked out of their room and left to cry. I believe it only took a week or 2 of every night of me banging and screaming at their door until I eventually stopped and stayed in my room. I do still remember it, but I don't feel emotionally scared by it nor did it affect anything else. Looking back of course I understand the privacy that they wanted and now as an adult I prefer to sleep on my own (husband and I have separate beds). So for anyone that wonders the long-term effects of CIO, at least for me there were not any even when I was old enough to remember it.