My dd is 22 months old and I'm thinking about trying her in her big bed but not sure whether to leave it a bit longer. She'll need to share a room with her older sister amd i don't know how they will be both together and I dont want her to end up acting out all night. At the minute she sleeps in her cot still in my room and they both sleep through the night (her sister is 4) what was the age of your little ones when they went into a big bed and if they shared a room with an older sibling did they still sleep ok?