How do you get your kids to stay in their own beds?

We have a problem. Two of my three kids refuse to stay in their own beds at night.The problem started when my wife was on hospital bed rest with our twins. Since I was at home with my first born, and he was having trouble with not seeing mom, I started letting him sleep with me for comfort.Fast forward a few years. He is now 7, and still comes into our bed every night. We continuously walk him back to his own bed, and he continuously end up back in ours. And now one of the twins is starting to do the same thing.We've tried making it a contest to see who can stay in their beds the longest, with rewards. Didn't work. We've tried giving praise to the one who does stay in her bed all night, the other two don't seem to care.This is a big problem. Not only are they waking up tired from going back and forth between rooms all night, but my wife and I are waking up tired and frustrated.How can we solve this problem? via /r/Parenting http://ift.tt/2fWqJhF