1959 childhood encounter with a spherical, faceted object, that had landed in my back yard in Miami.

It was some time in 1959.  I can't verify the date.  I was 5 and hadn't started school yet.  My family lived in Miami (our address was considered to be Opa Locka) but I would attend school the next year in Carol City.  We lived a short distance from the Opa Locka airport (then, a military airport).  Our home was not near anything but rock pits and cow pastures.  We lived on 1/2 acre lot.
 Some time, in the middle of the night, I woke up.  I saw the cat was inside and followed her through the house.  She wanted to go outside, so I opened the door and I followed her outside.  I walked into our backyard and saw at the back corner of our yard a large dark sphere.  Curious, I went closer to see what it was.
 The object sitting in our yard was about 40' in diameter and faceted - like a disco ball.  The facets were small and bevelled, but clear - like glass.  There was a lot of moonlight, so I could see the color of the glass appeared to be bronze.  There was no light emanating from it, but it looked like whatever was in it could have seen out the glass.
 I became afraid thinking that a door might open (and maybe it did - because I have a vague memory of seeing a black ramp extend from the lower fourth of it) and ran back inside the house and locked the door.  (Back then we NEVER locked a door.)  The next morning, my mother asked me what I was doing up.  (I think my return to the house and slamming the door woke her up.)  I told her I was letting the cat out of the house.  She thought I was sleepwalking, she said the cat wasn't left in the prior night.  I can't remember if I told her what I saw in the back yard.  If I did, that too was probably written off as "sleepwalking."  I may talk in my sleep, but I have not had any other experience with sleepwalking.  After this incident, I began having a recurring nightmare about being abducted by people who looked like my parents, but weren't.  I would be in the back seat of the car riding along with my parents, when I would realize they were different, not my parents.  I would jump out of the moving car and run back to my grandparents' home.  When I would get there, my parents would be there.  But, I could tell they weren't my parents either.  This recurring nightmare went on for about two years before subsiding.
 I am 53, female, have a slightly above-average IQ, and that's it.  I have often wondered if there's a relationship between the nightmare and the sighting.
Witness indicates that the date of the incident is approximate.  PD