The brain development is strongly linked to sleep patterns (mrt studies showed a correlation between bad sleep and learning activities in the brain).

There why you will have sleep regression patterns where it seems to get worse again. It’ll also get better again!

I’m not aware of any studies supporting this conclusively. The biggest factor seems to be brain development which parents can’t speed up at that age

This"sleep training" from the late 80s has a high chance of being seen in 20 years similar to whiskey against toothing pain from a decade earlier.

I can already here the people coming with “it worked for me!” and the utter lack of self awareness in that sentence.

Not Op here, from what I’ve read is that the answer to that question is unknown but he showed a significant tolerance for some. Does that make it himself fine? In my book: yes.

For me personally it was enoughto leave the project behind as it’s so closely tied to the person.

That’s a call everyone needs to do for themselves though if course