We have our 4 year old DS1 in a single bed in our bedroom, which works well for everyone. We moved him to his own bed when DS2 was on the way. DS2 is 21 months and recently we have moved him into a single bed pushed up against our bed - our bedroom is crammed full of beds! We love having our boys in the same room as us, having them in another room would feel weird. It would also be hard I think for DS1 to be in his own room when DS2 sleeps with us. Nice to keep everyone all together.

When DS2 was a baby he slept on our bed, I bought a video monitor so that I could make sure he was safe. The monitor was great, it enabled me to get up and do things while he slept. Now he's bigger, he just gets off the bed himself when he wakes up. I do still put pillows around the edges if the bed just in case he rolls when he's asleep. He's never fallen off though.