very bright changing color lights coming from window

this happened to me when i was a small child i was five years old i was lying in bed with my sister who was asleep and my parents were asleep also in a diferent room when suddenly and with no warning an extremely  bright light blasted through my bedroom window i think the first color may have been a white light and after about 5-10 seconds the colors would change i remember red blue white and yellow  and it made a strange sound when the colors changed. ironicly i would compare the sound to the sound you hear on the movie predator when your seeing in the predators vision. it lasted for about a minute then it just stoped and everything was calm and quiet again.after about 20 minutes after it happened i gained the nerve to wake my sister up and told her what had happened and asked her if she seen what happened but she didnt .i told my parents the next day and they told me i was dreaming and didnt believe me.i didnt see any craft or any beings or have any missing time it seemed seamless. i dont know if i was parylized or just too scared to move i probably would have hyperventilated but i was too scared to breath.there is only a mountain covered with trees looking out of that window about 75-100 yards away.i cant seem to think of anything else that this could have been besides a ufo.
Source remains anonymous.  Date is approximate.  PD