Hi B., I'm brand new to this helpful mamasource. I went through similar situation with my kids (20 months apart) - put them together in same room, my little guy did much better when he was not alone, they hate feeling lonely. And they will bond - noone cares, your aim is to get more sleep for your family. Our two yer old never woke up the other as you may worry, they tune it out. But put toddler bed against wall on one side and couch cushions or safety bar attach to other side. Since he is only 2 i think a gate is good, but tell him the gate keeps all the scary stuff or whatever he might be afraid of out (verses him in). We even filled a spray bottle with water at one point and told our boy it was magic spray "monster spray" or "bear spray" or whatever, spray it all around so he can see you do it if he is afraid tell him that makes all the bears, monsters, scrary stuff go away, (he was always telling us there was some darn thing scaring him in his room scary) and Tell him he is the best big brother and you need him to protect the baby. Put his fav. blanket or sleeping bag on his bed, and a poster on his door, tell him he gets a special surprise if he stays in the bed all night then, for 2 nights in a row, then up it to 3 and 4, when he gets to 7 you do something real special, or go for icecream, let it be somehting he gets all excited about, for him and each morning thank him for being the best big brother and taking care of the baby. Get a bed time ritual going that clues him bed time is coming and it is a nice thing, pj's maybe an hour ahead of time, I used bubble blowing in the bathroom, then teeth brushing, then a story, have a choice of 2 or 3 of his favorite books, let him choose - all of this makes child feel in control of the situation, and if he has trouble listening, stop mid sentence and let him fill in the story, or get him to point to things, to get his mind off of stresses and focused. and make sure there is a night light. Soft music also helped us, on a radio volume very low, but make sure cord and radio can't be pulled down on him. We tried all kinds of stuff, i'm hoping this helps. And i'll share this with you, the same kid that would never sleep for more than 20-40 mins round the clock, (until 23 months) when I finally put them together, now has to be dragged out of bed by his ankles for high school. Good Luck!