DS 10 months, is still in our bedroom, where there is just enough room for a space saver cot. The thought of putting him in with DD3 is terrifying- they are both such shit sleepers I think I would just end up on the floor in their room all night while DH lounges in our bed by himself.
I need to do some sleep training because I am breaking. Last few nights I've been surviving off 20 minute chunks of sleep. The days are tiring and tough but the nights are so, so dark.
With my dd I did CC at 14 months and it saved my sanity, but she was older so she understood what was necessary (I knew she was ready when she put her dolly to bed and patted it saying night night). He is younger but if I wait much longer I will actually break, or walk out or hurt someone.
So how to do it if we share a room? I've been putting it off because I feel like my 'job' is to keep him quiet so everyone else can sleep, when he cries and wakes DD up, I just have 2 kids awake to deal with. She is currently waking 1-3 times a night too 
DH wants to help but both kids only want mummy, and up until now I've been doing whatever it takes to get everyone back to sleep the quickest. But this is taking its toll on me and I don't know where to start. I need some help, and some sleep, and some time alone in a dark room with no one touching me!!!