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>Babies cry for a reason (to get their needs met). Yep. Including, "I woke up and I don't yet know how to put myself back to sleep," which is where "sleep training" helps. I, too, would be curious as someone else asked, if you have children.
You can do such training without being a cruel hard ass about it either. You know your kid best and know their limits and when you should go into their room to comfort them... but you have to know why you are doing it--you are teaching them how to sleep. The only way they can learn that is by themselves (at least at an early age).
Sleep training our daughter was one of the best decisions we made early on. But every kid and every parent is different. There is no one single way to raise a kid...