toddler sleep

Several months ago we had to transition to a toddler bed because our then 18 month old figured out how to climb out of bed and would always get hurt. Ever since almost every night she gets up from about 1:30-5 and plays and runs and yells. I finally broke down and called her doctor for advice and got "get a baby gate, she'll grow out of it". She sleeps in a room with her brother who rarely wakes at night without her waking him and bubby gets up at 3 for work. I really need advice. At this point I'm desperate. We've tried short naps, no naps, night time lotion, noise machine, and even waking them up earlier and still nothing.