Persistence & consistency. Matilda went into a bed at 16 months because she would climb in & out of her cot. It took us 4 weeks to get her to go to sleep easily on her bed. The first 2 were just continuously putting her back into her bed, or patting her bum until she fell asleep. Some nights it would take 2 hours to do. day sleeps took an hour or so. After 2 weeks she "knew" what the rules were but kept going... after 4 weeks she stayed in her bed and didn't get up. Good luck!