With all three of my children I have had these terrible nightmares:
About 30 mins after falling asleep I wake up, with my heart jumping, convinced that my baby is dead. I reach over to her/him (we co-sleep), and am still convinced that it is true. Sometimes I actually pick them up, sometimes I just feel their chest for breathing.
It is so disturbingly real, my heart is racing then and I am terrified...
then, just as suddenly, I realize it's just a dream.
With the dd's these nightmares disappeared once they were about one, and so I'm hoping they will disappear soon with ds.
Very disturbing though, and I wish I could make them stop!