@ebveloz If I can talk about my own experience, I was never given any sleep skills. I slept separately from my parents, but I was up - all night. Up and down.
My parents gave me a teddy bear, and reassured me, but I was never given a chance to learn how to self-soothe.
I grew up tired - I was often distracted from tiredness from school & it made my anxiety & ADHD worse.
My lack of sleep skills still exists, although now I’m genuinely tired enough from working full time with a toddler that I sleep well.
My mom deeply regrets not helping me more. Melatonin wasn’t a thing (at least to us) in the 90s, the doctors always blew her off, and she was always told sleep training was “mean”.
I also have to note - because of my sleep issues, they sleep trained my younger sister at 6 months old, and since then she has been a fabulous sleeper.
Extremely anecdotal but a different viewpoint.