It may happen at the same time. I don't know that I would try to do both on purpose. With Lucca, I slept with her in her bed then just started getting back up after she fell asleep each time. The first couple nights I was up all night
but she was totally ok, I stayed with her until she fell asleep. Now she falls asleep in her bed and if she wakes up I either bring her in with us or lay with her until she falls asleep again, depending on how tired I am. I don't really know how we made the transition. I started out staying until she was totally out, then started backing up how long I stayed with her until I was leaving once she was settled but still awake. Right now she falls asleep in her bed with me sitting beside her, I usually tell her stories until she's asleep while I get DC to sleep. That probably doesn't help at all, Lucca is hanging on my leg right now so thinking is kind of hard