There are a lot of factors. Less awareness is part of it, but also that BFing mums and babies tend to wake more often, the position of mum and baby tends to stop baby getting to the pillows, a BFd baby moves around the bed less (focus is on the boob) and BFd babies are at lower risk from SIDS even when they sleep in a cot (so presumably there is something about the milk itself which has an effect on sleep patterns). When I had DS, I read somewhere that a baby under a certain age should only ever sleep in an adult bed if they are next to a BFing mum, and not dad or other siblings. I also saw a recent news thingy about a study in the US.... all the cases of babies who died while sleeping with adults over the period of 18 months were bottlefed babies, without any exception.... I think maybe FF is pretty much the norm in the US, especially in some parts... but even so, it's hard to believe that is merely coincedence.
I'm sorry, but I don't believe this at all. Having BF and FF I can say with some confidence that there has been absolutely no difference in my awareness, sleeping patterns, sleeping position, and the issue about SIDS is quite simply a red herring since deaths caused by co-sleeping (usually rolling onto the baby) are nothing to do with SIDs which is an unexplained death. So the fact that a BF baby may be at lower risk of SIDS doesn't make them at lower risk of accidental death from improper co-sleeping.
I have to say that I have never seen evern the slightest suggestion that you shouldn't co-sleep if you FF. If I see such a study, I will read it with interest. I am not someone who poo-poos research where the issue is something that can be properly isolated and quantified, but something like co-sleeping involves so many other factors that I think it would be difficult to isolate a single risk-factor like feeding method. Perhaps the people in this study were less well-informed generally and didn't know about the benefits of breastfeeding just as they didn't know about the way to co-sleep safely.
There are so many reasons for a FFing mum to feel that her child isn't getting the best, without suggestions starting up that our bond with/awareness of our baby is less than it could be. I know how aware I am of my child and I can assure you that he has never been at risk in bed with me simply because I don't BF.
The thing about FF making cosleeping less safe is JUST what I was told.... don't shoot the messenger!
We may not be aware of any changes in how deeply we sleep or our awareness of LO.... but I don't think any of us can know with absolute certainty changes are not happening on a deeper level, subconsciously, or changes in our body's biochemistry (not sure if that is the right word) because of BFing, or stopping BFing. I found I was definitely less aware of DS after I stopped BFing... BUT I can't know for certain whether it was that that caused it or whether it was that he reached an age where he didn't NEED me to be as aware and to rush to his side immediately as he did when he was a couple of weeks old. I won't dismiss either possibility out of hand, though.
I've used FF and the bond with my kid is great as far as I am concerned. Regardless of whatever studies say on the subject may say, I'm happy, he's happy, what more matters? I could write pages and pages about bonding and hormones and chemicals in the brain and lord knows what else relating to BF/FF but hardly any of it would be relevant to co sleeping and none of it would change the fact that my child (and doubtless yours as well) is happy, healthy and we adore one another..... so, meh
Glad to see the law hasn't gone COMPLETELY crazy