We have our two girls in together - we did have DS and DD2 in together, but he would wake her up with his tanties at bedtime (he's 3.5) so we put the girls in together and at the moment its working fantastic!! They both self settle though, so we put them down at the same time, and then they both go to sleep on their own. DD1 has just turned 2 and DD2 is 8.5 months.