Why do we have certain dreams at night?

Dreams are symbolic and the meanings are usually not literal. What goes on in our walking life reflects in our dreams. I can only assume that it's fear based. Basing from my experiences there are dreams that shows the future, other times just dreams that don't make sense. Also, I think it's a warning sign to be cautious so that negative things avoided.

why do we have certain dreams at night? i guess its because your thinking so much in one thing before you sleep. and you will certain dream about what you thinking before you go to bed

i think you might be scared of dying?

No that means that in reality you are scared of losing some important aspect of your life or worriabout the same.

Dream is counter part in true life. It means life, More live and happy living.

Not necessarily, normally whatever we dream about is usually a sign of something completely different. Or it could just be something we have heard/seen in real life which then drifts into our dreams

I dont know that its all in your subconscious. I have some weird dreams some time but some seem so unrelated to life.

No. its may be devils actions

I had a dream too. I saw myself inside a coffin. I was so scared. Maybe it was a warning or something because I got sick. I have chronic disease.

I've heard that dreaming about dying is good luck. Maybe it's true