I only discovered this last night and not in a good way. 
Ds is 11 weeks and we've been co-sleeping since he was about 5 or 6 weeks. We've got a sidecar cot but in practice, he either starts the night in there and joins me for the rest of the night after the first feed in our bed (usually about 1, so most of the night) or doesn't settle in the cot at all, in which case I just put him in with me straight away and he sleeps beautifully.
It's worked brilliantly as far as ds and I are concerned - he sleeps really well between feeds and doesn't even have to wake us up by crying when he's hungry, just snuffles at me and I get a boob out then drift off again. I never dreamed you could do this before having him and I am happy with the arrangement, I was going to carry on for as long as the night feeds continue and possibly longer if ds wanted.
But DH wants him out of our bed. Last night he came in about an hour after I had gone to bed with ds - we were both asleep and he was in with me. DH just took him away, waking us both up, and put ds in the cot, not even trying to resettle him, then got into bed. Of course, he started crying, and I was annoyed at being woken too! I asked DH what he was doing and he just said ds has to learn to sleep on his own and he 'doesn't think it's healthy for him to be in with us long-term'. I said I didn't think it could be considered long-term when he's not even 3mo yet!! DH suggested waiting half an hour (!) to see if he settled in the cot, I don't think he planned on doing anything to help though, just leaving him to cry.
I just took him back in and DH went to sleep in a grump. I am really annoyed. This arrangement benefits me as I would far more disturbed getting up to feed if ds was in a separate cot or - what DH really wants - his own room. I don't see why he can't be patient for a few more months while ds is tiny. Am really disappointed and a bit sad that our parenting techniques seem to be so opposite. Not sure what I'm asking really, just any advice. I recognise that for co-sleeping to work, all three of us have to be happy with it. But I'm sad - and resentful, tbh - that I should have to stop just because he demands it. And then get less sleep. WWYD?
Oh God, sorry that was so long.