I've never been averse to having a child in bed with me if that was what they needed to do to get to sleep, though it isn't my first choice.
Grace has in many ways been our easiest sleeper, I think I got lulled into a false sense of security! About 6 weeks ago she stopped sleeping through the night and it wasn't just a case of waking a bit earlier, it was waking 3+ times with no longer stretch between any of them.
Her first waking became before I even got to sleep, even if I went to bed right when she did.
Then she started rejecting her cot, she'd been a dream, we could put her down awake and she'd go to sleep, now we can rarely get her in there asleep, however gently we try and move her!
So I started lieing down with her when she'd feed anywhere between 10pm and midnight and I'd end up falling asleep too. I worried because of the meds in my system, but despite no concrete evidence I decided that even with them I'm not a heavy sleeper and she's no longer a newborn that can't wriggle, move, roll etc. so on balance the daytime risks to all the children of me getting minimal sleep are probably greater than the risk to her of me sleeping next to her.
It's been about 3 weeks now and I'm beginning to feel that we're both figuring out what to do and sleeping better, though last night wasn't so good.
Unfortunately she's having the same issues with daytime sleep, so it feels like it's a constant challenge to ensure she gets enough sleep.