"self-made dreamy"

When i had my first email address, i named myself dreamywen. now i don't know why i actually give myself such a silly name, and my parents especially hate it!! haha! they say i'll become dreamier & dreamier having dat name. well well, i'm really always day-dreaming. it's fun at times, but sometimes i juz dozed off like dat, not realising wat had happened the couple of minutes b4...and recently it got worse! i was talking in my dream! it happened after that nite my sis talked in her dream. i couldn't sleep dat nite.
"......"
"wat r u saying?"
"......"
"i can't hear u." (but i was sure she was repeating the same sentence)
"......"
"are u dreaming?"
"NO." (dat's the funny part! coz she really is dreaming!)
the next nite, it was my turn, but only i realised it myself. it happened again another day. but this time she heard me. and i too woke coz i dreamt of a scary person!! argh!! the conversations were juz weird, but i forgot most of it.

the question is : why do we dream?? and dreaming of such weird stuffs?
think hard, and i bet u'll laugh at most of the dreams u remember... they're juz sooooo stupid!!!