dream..

why is it sometimes when you sleep, you will dreamed of something, or rather, dreamed of many different scenarios at 1 night. was the dream conjured up by our own imagination? or was it something subconsciously? and sometimes...it could be so real as though one would not even know they are dreaming.

today i had this dream which is so real that even in reality, my body is reacting to it. i woke up with eyes in tears, and the dream isn't something good to talk about it..