A related argument is that although children may look fine at five or six years old, the damage from sleep training may not manifest until they are adults. Again, very hard to study. I think it is fair to say that it would be good to have more data—it’s always good to have more data! And yes, it is possible that if we had more data, we would find some small negative effects. The studies we have are not perfect. However, the idea that this uncertainty should lead us to avoid sleep training is flawed.
