I feel your pain .. I am in the same position - only my neighbour hasn't complained YET. For me, it is impossible to separate them because they will claw up the carpet trying to get at each other and will keep us up all night!

One thing you can try is feeding them twice a day .. morning and night .. so at night feed them before you go to bed and hopefully they will be ready for a long night's rest after eating. And also try and play with them a while before you go to bed to tire them out.

You can try it .. I have too ... It doesn't really work for me thought - I don't know what it is with my two! They will not get along well, they don't snuggle, all they want to do is wrestle and bite each other!