Is this a bad sign?

So Sunday night/Monday morning I had a TERRIBLE nightmare. It included 2 of my students. I was at some sort of water park/amusement park with water involved and it was the end of the water park day or activities or whatever was going on (this part is a little fuzzy). I was in some sort of boat or canoe and was strapped in somehow. My 2 students were walking on a pier/boardwalk to get out of the park. All of a sudden, they were in the water and could not swim. They were drowning. PANIC sets in and I (strapped in, in the boat/canoe) try to get out of the boat to try to jump in the water and SAVE my children! I am frantic, finally get out and start to swim over to my students. I wake up as I cannot save them and my students drown to death. I woke up in a sweat and panic and crying.......so traumatic for me!

1. WHO has this type of horrible horrible nightmare about their students?
2. Is this a bad sign?
3. I have only been teaching for 6 months and I am already having nightmares of my students dying?
4. Those 2 students better not get anywhere near water for the next 5 years.
5. I need to try harder to shut my brain off from work thinking when I get home but it is really HARD!!
6. AHHHHHHH!

I am exhausted and cannot wait for my winter break, 1 week off --> going to Florida to visit my Grandparents and stopping in NYC on the way down to visit my Uncle.

Hopefully after this week off from school/work/kids I will be able to turn off the work thinking at home and I will not have any more nightmares about my kids dying. Enough of that!