Disc shaped object over Lake Stevens WA

When I was a young girl, approximately 10-12 years old, which would be summer of 1960-62, I was sleeping outside on my parent’s deck in the Lake Stevens, Washington, area.  I awoke from a sound sleep to see a large, round disc shaped craft hovering directly above me.  It was metallic silver with rotating round flashing colored lights around the outer rim, with whitish smaller lights underneath.  I was looking directly at the bottom.  It made a very low humming noise.  There seemed to be an opening on the bottom of the craft.  There were several other disc-like craft hovering behind (above) the one above me.  I remember a shaft of light.  I do not remember anything else.  I don’t really recall it flying away.  
When I woke up, I remembered it and told my Dad.  He believed me, but I don’t recall anything else being said about it.
This memory has stayed with me all these years.  I am now 63 years old.  I have always wondered if it was just a dream or if it was real.  I have been interested in the UFO phenomena as an adult because of this very vivid memory.