I have never been one to remember dreams but in the last week or so I have been having nightmares one night to the point of physically grabbing dh in my sleep. They have all been about bad things happening to my children but not always both of them are in them.
Its probably your subconcious worrying about something, try and write the dreams down when you wake up and analyse what you think the things could be. Is it the same thing each time, a specific thing happening to a particular child, what are you doing in the dream.
Don't eat any meat or cheese before bed too as I find this makes my dreams worse.
Also, you can control your dreams by waking yourself up. I have terrible dreams that are so real and I just stop in the dream and look around and realise that its time to wake up.