I think you just need to do whatever works for you.
For Mia, she wants someone to "watch her" while she sleeps. those are her words. and even the promise of a lucky packet or treasured item she says she rather wants to sleep with me.
For me, having her in bed with me is when I sleep at my best aswell. Just knowing she's ok, and she's right there. As far as Hannah is concerned, it's easier to just lean over and plop the dummy back in than to have to get up walk across the house to Mia's room, plop it back in and then get my freezing backside back into bed
Mia is a lot like me in the sense that she loves that "close" feeling. Hannah I'm not sure about yet, but she's more on her own than Mia was and so far a much easier sleeper than Mia was. I can just put her down and she normally goes to sleep, whereas Mia had to be danced or rocked to sleep for months - even when she got just about too big to hold and dance with.
anyway, that being said, it's going better with Hannah. I've resigned myself to the fact that summer is a few months away and then she'll sleep better when it isn't so darn cold.
xo