dd didn't sleep well, during the night or day, as an infant so often Dh would escape because he needed some sleep. Once dd was sleeping through the night at 15m things got alot happier for everyone. I think we became a family bed by 9m as dd was only waking once a night and we could latch in the dark, something we couldn't early on and turning on a nightlight and the crying was too much for Dh. Now, dd is near perfect (goes out fast, like 1 minute, and doesn't stir till after Dh leaves for work). So co-sleeping is a piece of cake and nobody feels a need to change things.