Hi my 19 mo b/g twins sleep separately for naps and at night because DD was such an unsettled sleeper when she had reflux. This has worked out fine for us, although I sometimes feel guilty about their lack of twin bonding time, I then think, well, they have the rest of the day for that and the break from each other is probably also nice for them. My DD loves running into to find DS when she has woken up and they always have big smiles for each other.