You definatly have your hands full. I had the same problem with my daughter, now 3, and luckliy got my son in his own bed now, he's almost 1. Anyway, you might try a reward system, that's what I did with my daughter. Kids love to be noticed for good deeds and really like to get rewards. I put up a calender above her bed and everynight that she slept in it, by herself, all night, she got to put a sticker up for that day. After a week she got to watch a special movie, then she had to do it for two weeks and once she hit that she got to do another fun activity. I then went for a whole month, and she did it, which in turn she got to go to the store and pick out a new, small, inexpensive toy. By the time she hit the first week or so in the month it wasn't a struggle and once we hit the month mark, we stopped using the chart. I now have more problem with her going to sleep, she thinks she will miss something. Hope this works, but if you have questions about it, let me know. P.S. Since you have twins they may compete to see who can do it better, and it may work to your advantage.