Re: 3 year old discipline and sleep problems
I have a 2 year old with the same kind of thing going on, and yes the sleeping problem definitely got worse when we had baby 2 recently. But in the end, we decided to not fight her wanting to stay up. So I refused to make a big deal out of it, I ignored her and she got bored because she wasn't getting any attention from me that way. I also read her 3 stories every night to spend some alone time with her and that helps because she really enjoys it, and if she doesn't behave then I take the books out of her room. Hang in there, in the end she is probably testing to see how much attention she can get.
Good luck with #2