dreaming

do dreams appear in your head by accident? can we control a dream? do we even remember them.....clearly? if i had a certain dream when i was say.....six years old, would i have the same dream now, when i'm going to be fiftyfour? i know there has been alot of research on dreams and alot of misreading of dreams but what exactly are these little movies in your head when you are lights out? are they the last thoughts before you dim the lights? why do they occur and why do they show up when they do? just wondering, i suppose i''ll never really know. pleasant dreams....jack c.........anybody out there have any dreams they would like to share? the rain is falling outside my window, in tiny drops they flow, off into the street they roll, surely better than the snow