[The Big Chill]

My little girl is 1.5, so I haven't hit some of the regression stages you have yet, but we have a few strategies that have worked so far.

She likes to do things on her own and make choices, so instead of presenting a yes or no question like 'do you want to go to bed?' we have much better success with 'do you want your red jammies or blue jammies?'. We find that helps with every situation, not just bed time.

For actual sleep time, all the research we've done says they need to learn to soothe themselves. If you rock them to sleep then they don't learn to put themselves back to sleep when they wake up at night. Use the 'reset'. Put him to bed, let him cry for 5 minutes, and then go back in and say goodnight, time for sleep, and leave right away. Stick to that for as long as it takes. It might be a crappy week for everybody, but should be better in the long run

Now that I've given my advice I look forward to my kid rejecting all these techniques!