S.L.
I don't have twins but two of our children parent twin boys, identicals. The oldest ones are now 14 years old, but the 3 year old boys just were moved not long ago into the crib converted to toddler bed. It was a bit of a change and not staying in bed, etc. but is getting better I think. At my house they only nap ( so far since the cribs are down ) and they sleep in separate rooms on air mattresses for nap time. It works well when they are not in the same room. BUT child proof EVERYTHING when they are out of the cribs. They are sleeping better if they are very tired but at first it was not good getting them to go to sleep. My first two were 12 months apart and that was the worst time for me with them, getting them to go to sleep and not bother each other getting in and out of bed, etc. I had to discipline them consistently.