If you're feeling a bit unsure about your 18 month old being in his own room, I'd go with it and keep him with you. That sounds like maternal instinct to me. Certainly, he'd almost definately be fine but it's still always easier to follow your instincts. Apart from that, I think that getting children into their own beds and rooms is something that has to be handled very delicately by parents; I had massive separation anxiety as a child and slept in my mothers bed for a very long time. I eventually outgrew it, but in retrospect the reason why I was illogically terrified of my own bed and room was that it was always something negative. My mum pushed me into it when I was unwilling and used it as a punishment. The nights I was in my bed as a child I cried myself to sleep. Gentle, positive encouragement over power struggles is the way to go. It may take longer but it'll be better in the long run. Good luck! Let us know how it goes.