onedog - Some of the comments about increasing anxiety were mine.
The thing is, I have no objection is people say "I realise that the difference in risk is very small, but personally I want to X".
It is the seemingly growing societal expectation that you will abandon all semblance of a life for your baby. And that to do otherwise makes you selfish (because how dare any mother weigh her own needs in the balance). The poor OP clearly wants, at some point, her baby to go to bed and have an hour or two by herself. That is perfectly normal and the risk assessment made by probably 99% of the population is that, at some point, before they are six months, they will leave their baby sleeping in another room for some period of time.
If people want to be ultra careful, that's fine. Just like it is fine to decide you'll use a breathing monitor at all times until 12 months. It's just that creating a culture where there is an enormous burden of fear that you are somehow 'risking your baby' if you do otherwise is massively detrimental to maternal mental health. And therefore to babies. And is also just daft.
I do feel freakanomics maybe could do a whole book on childrearing. I suspect the risks we worry about are not the ones that are likely to 'get' us.
"Don't worry about the future
Or know that worrying is as effective as trying to solve an algebra equation by chewing bubble gum
The real troubles in your life are apt to be things that never crossed your worried mind
The kind that blindsides you at 4 p.m. on some idle Tuesday"
Wear sunscreen today people!
(I realise I am old and many people will not get this reference)