I have had the same problem with my 5yr old since she was born!! I had talked with the pedeatrician and basically he told me what I already knew. Don't let them see they are winning over u, ur child gets up walk them back immediatley to there bed. They will scream,kick,and say ur a mean mommy but trust me it's so worth it. My daughter used to make her self throw up to try to get over on us,I had finally got so frustrated I gated her room and she ended up finally sleeping in her bed. That only took one night because she hated being gated. I really think it's harder on us then the kids,because we hate to see our children cry or be upset but I am so glad I did it.