Dreams

It happened again last night where I dreamt of blood, lots of blood, later finding out that it was coming out from below...I was bleeding so much it finally dawned I me that I was having a miscarriage. I scared myself so much I woke up to check. Luckily not a reality. Dream moods and the book said it was common to dream about a miscarriage during the 2nd trimester. But really, why is that so??? It's so disturbing! Since I'm so stressed out during the day, why can't my nights be peaceful??? I hope everything is ok with the little one...