With 2 babies in 2 years.  Sleep was a huge issue in this house.  Dr.  Karp's methods are great.  You just need to stick to them.  I think there are a few different methods that work well, it's just a matter of finding what you are comfortable with and sticking it out.  My best advice is watch this and then follow what rings true to you.  Remember it is one thing to watch a dvd and another to hear your baby crying at 4 in the morning.  Stay strong!!  This DVD gives you much needed ammo!