Hi, and welcome to PT. I have a couple of night time talkers, and it is annoying, isn't it? Things that helped me- more than one cat (seriously, as sometimes they are lonely), lots of cat time right before bed, some talking back from me...letting them know everything is 'okay', and if all else fails, I go find the offender. I then shower him/her with affection to the point where the cat wants nothing to do with me, and runs off! I haven't ever found isolating them, be it the garage or another room, has made any difference. I think they WANT attention, so, to not give it just makes it worse.

Good luck!