K.A.
Everybody has their own beds but it doesn't mean they sleep there. My 8 year old sleeps with us sometimes when he's having nightmares or sick. My 3 year old sleeps with us on and off as she's going through night terrors and right now has a cold. My 11 year old is the only one that doesn't sleep with us at night though he'll come in to cuddle if he gets up a little earlier than us and will lie down to cuddle before going to bed.
Around here it's more important that everyone is getting enough sleep then where that sleep is taking place. It works for us. We certainly get a lot more sleep then if we were roaming the halls or listening to upset kids.