The whole regression thing is BS. I don't know why people expect kids to be different to you and I. Or are you telling me you religiously whack your head on the pillow, drift off, and jobs a good 'en? You'll have nights when you have niggles, pains, cramps, things on your mind - you'll have times where you lay awake for hours and others you'll power on through. Sometimes you wake fresh, sometimes you don't. Sometimes you go to bed early only to find out you wake up ready to start the day and it's only 2am.
The only thing they need before bed is a fully tummy, clean pyjamas, to be well rested during the day (midday nap for 2hrs) and if they are teething/otherwise suffering, a banana and calpol. The banana helps the calpol slow release.
And don't run in at the minute they make a noise, for the reasons I stated in my first para. They are just peeved they woke up, and it'll take 10-15mins to settle. The more practice they get at self-settling, the less you will have to do.