Yes, they were 45 years ago, but I do remember vividly dreaming that the baby fell out when I was in the shower - and I didn't shower at the time but lolled around in the bathtub.
Once, soon before the birth, I dreamed that Baby* was in bed with us and I rolled over an squashed and killed her. Lucas had the same dream. We didn't talk about them until later, so I don't think we influenced each other. That is why we were both stunned at the thought of the Family Bed that was so talked about at the time.
*That was before we could know what the gender of the child was without x-rays, which were used only in emergencies, or amniocentesis, which was very invasive and again only for scary stuff, like suspected Down syndrome.
This reminded me, I have these dreams now (while pregnant), but I've had them since DS was born (so when I wasn't pregnant as well). In my dream: DS is supposed to be asleep next to me. I wake up and can't find him. Where is he? I start searching the bed and under the blankets looking for him. Sometimes in my sleep I call out "Where's my baby? Where's my baby?"
DH (who is awoken by my flailing and noise - often I hit him or try to look underneath him) tells me the baby is in his bassinet and to go back to sleep, and I do. Sometimes I wake up when he is calming me down and remember the whole thing, other times I stay asleep and have no recollection and he tells me about it the next day.
Now that it's summer here there's less blankets on the bed, but DS can crawl & walk, so often in my dream he is going to crawl or jump off the edge of the bed, so I am up at the foot of the bed pawing around at the corner searching for him.
We did bed-share a bit between 6 months and 11 months, basically my rule was I don't stay up out of bed for more than 10 minutes. So if he woke up and needed me, he came in with me so we all got to sleep. But these dreams started waaay back when he was a newborn and I never had him in our bed! So I think it was more primal e.g. my mind going "you've given birth, so where is your child?" They can be really jarring though. For those moments, in my sleep, I genuinely fear for where my baby is. I guess definitely a nightmare not a dream!