Almost 3 years between DD1 and DD3. They currently share a room, but only started when DD2 was 2 1/2, prior to that she was co-sleeping with us. So I can't really comment on putting a baby in with a sibling.
At the moment the sleeping arrangements mostly work. There is the odd fight about lights out and what music to put on (they have sleepy music). Most of all they seem to like each others company. DD1 will complain of being lonely if DD2 sneaks back into our room.
We have 3 years 8 days difference and my girls have shared a room since dd2 was about 11m old. They love it! Sometimes they fight about music but dd1 often goes to bed later so dd2 is already asleep. I'm sure as dd2 gets older they will have other issues lol. We have all their toys in the spare room so they share that too. They are currently 6 and 3 and the are really good buddies, play mates and sharers. They miss each other if they are not in the same room at night.
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