I have been - when we were in hospital, lying down together was the only way Adam would feed; the midwives encouraged me to have a nap while he was sucking. Since we've been home, we put him in his cot (which is a co-sleeping one but there's a gap we need to fill with something safe so the beds are not flush yet, so I have the side part up) and he will sleep a coupe of hours in it then I take him into bed and he feeds. I never mean to fall asleep but can't help it. And I feel scared that I'll smother him, even though I keep the pillows and duvet well away from him. We took the memory foam mattress topper off as it's too soft and retains heat too well, the mattress underneath is pretty firm.
My mum sounded shocked when I told her I'd been doing this but I can get some sleep and am functioning the rest of the time because of it.
We don't drink, smoke or take drugs... I guess I need to read up about co-sleeping, it was never my intention to have him actually in the bed, even though I wanted the benefits, which is why I got a co-sleeping cot.