I was a skeptic about the supernanny too and I don’t watch the show but her book has a technique to help reluctant sleepers adjust to staying in their own beds that really worked for my kid. He’s a teen now and still has a hard time falling asleep, it’s just how he’s wired.
I'm not skeptical of supernanny, I'm skeptical that simply changing the name from "timeout" to "naughty step" was the primary cause of any observed effect (rather that the whole slew of other, more meaningful, changes that were introduced at the same time)